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Thèses sur le sujet « U 238-u 235 »

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Auteur : Grafiati
Publié le 4 mai 2024

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1

Braid, Ryan A. « The Calibration of a Fission Chamber at 14 MeV : Accelerator based Neutron Beam Detection ». Ohio University Art and Sciences Honors Theses / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors1276710315.

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2

Miller, Zachariah W. « A MEASUREMENT OF THE PROMPT FISSION NEUTRON ENERGY SPECTRUM FOR 235U(n,f) AND THE NEUTRON-INDUCED FISSION CROSS SECTION FOR 238U(n,f) ». UKnowledge, 2015. http://uknowledge.uky.edu/physastron_etds/29.

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Two measurements have been made, addressing gaps in knowledge for 235U(n,f) and 238U(n,f). The energy distribution for prompt fission neutrons is not well-understood below 1 MeV in 235U(n,f). To measure the 235U(n,f) prompt fission neutron distribution, a pulsed neutron beam at the WNR facility in Los Alamos National Laboratory was directed onto a 235U target with neutron detectors placed 1 m from the target. These neutron detectors were designed specifically for this experiment and employed a unique geometry of scintillating plastic material that was designed to reject backgrounds. Fission fragments were detected using an avalanche counter. Coincidences between fission fragment production and neutron detector events were analyzed, using a double time-of-flight technique to determine the energy of the prompt fission neutrons. A separate measurement was made, investigating the neutron-induced fission cross section for 238U(n,f). This measurement also used the pulsed neutron beam at the WNR facility. The neutron flux was normalized to the well-known hydrogen standard and the fission rate was observed for beam neutrons in the energy range of 130-300 MeV. Using an extrapolation technique, the energy dependence of the cross section was determined. These new data filled a sparsely populated energy region that was not well-studied and were measured relative to the hydrogen standard, unlike the majority of available data. These data can be used to constrain the fission cross section, which is considered a nuclear reaction standard.
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3

Chen, Yong. « Delayed neutron emission measurements for U-235 and Pu-239 ». Thesis, [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1134.

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4

Godoy, J. M. [Verfasser]. « Entwicklung einer Analysenmethode fuer die Bestimmung von U-238, U-234, Th-232, Th-230, Th-228, Ra-228, Ra-226, Pb-210 und Po-210 und ihre Anwendung auf Umweltproben / J.M. Godoy ». Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/1196112010/34.

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5

Jaeger, U. [Verfasser]. « Herstellung und Untersuchung der protonenueberschuessigen Plutonium-Isotope 232 bis 235 / U. Jaeger ». Karlsruhe : KIT-Bibliothek, 2010. http://d-nb.info/1187253537/34.

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6

Pons-Branchu, Edwidge. « Datation haute résolution de spéléothèmes (230 Th/234 U et 226 Ra/238 U) : application aux reconstitutions environnementales autour des sites du Gard et du Meuse/Haute Marne ». Aix-Marseille 3, 2001. http://www.theses.fr/2001AIX30094.

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Nous avons réalisé l'étude de spéléothèmes du Gard et de la région de l'Est du bassin de Paris. La datation fine a été appliquée aux reconstitutions environnementales actuelles et passées pour les derniers 250 ka. Cette approche vise dans un premier temps à valider les datations U/Th réalisées a haute résolution et sur de petites quantités de matière, sur la période de temps très récente (0- 10ka BP) pour laquelle cette méthode est difficile à utiliser. Parallèlement, nous avons teste sur cette période de temps récente et sur les mêmes échantillons, la datation par excès de 226 Ra. Pour toute la gamme d'application des datations U/Th, nous avons teste plusieurs modes de corrections des âges, pour prendre en compte les biais liés à la présence de matériel détritique dans ces carbonates impurs. .
We have investigated the Gard and the eastern Paris basin environmental reconstruction by using U-series dating of speleothems. The first aim of this study was to validate the high resolution U-series dating of small size samples over the recent period (0- 10 kyr) for which this method is of difficult use. For this period, we also have tested the 226 Ra dating techniques for the U/Th dated speleothem. For the whole period on which U/Th is valid, several correction methods were compared in order to take into account bias due to detrital material within these impure carbonates. These methodological investigations enabled to investigate several research axes. We discussed the origin of speleothems breaking from a Gard cave. Speleothem U/Th dating has been used for a chronological scale for the Eastern Paris basin karstification. We have shown the importance of the presence and the erosion of a non carbonated cover overlying the karstified limestone on the speleothem uranium composition. .
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7

MALHEIRO, LUCIANO H. « Disponibilidade de sup(238)U e sup(232)Th na utilização de fosfogesso na agricultura ». reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11787.

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Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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8

SANTOS, JÚNIOR José Araújo dos. « Avaliação radiométrica do U-238, Ra-226, Th-232 e K-40 em uma área anômala do agreste de Pernambuco ». Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/9472.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico
Estudos radiométricos e radioecológicos vêm sendo desenvolvidos mundialmente, em busca do mapeamento de áreas com elevados níveis de radioatividade, um pré-requisito essencial na investigação da exposição à radioatividade ambiental. Nesse trabalho foram estudadas amostras de rochas e solo derivado de uma área efetivamente anômala em urânio no município de Pedra, Pernambuco, utilizando análises não destrutivas, com aplicação da espectrometria gama de alta resolução com detector HPGe, para os radionuclídeos das séries do 238U e do 232Th, assim como o 40K, calculando-se suas atividades específicas. Os valores de 238U variaram de menor que 2,8 a 79.092 Bq.kg-1; os de 226Ra de menor que 0,6 a 144.438 Bq.kg-1; os de 232Th de 6,9 a 1.903 Bq.kg-1 e os de 40K de menores que 4,7 a 2.274 Bq.kg-1. Uma estimativa dos teores, das taxas de doses gamas naturais e do rádio equivalente foram realizadas com base nos valores das atividades específicas. Os teores médios em solo foram 3,3 mg.kg-1 de 238U; 0,7 ng.kg-1 de 226Ra; 39,3 mg.kg-1 de 232Th e 3,4 mg.kg-1 de 40K; em rochas graníticas, os valores médios foram 2,0 mg.kg-1 de 238U; 0,6 ng.kg-1 de 226Ra; 40,2 mg.kg-1 de 232Th e de 3,1 mg.kg-1 de 40K; enquanto nas rochas cálcio-silicáticas anfibolíticas, as médias para 238U, 226Ra e 232Th foram 3.132 mg.kg-1; 1.886 ng.kg-1 e 119 mg.kg-1, respectivamente. A taxa de dose equivalente efetiva devida a radiação gama natural a 1 m da superfície e o rádio equivalente estimados, apresentaram, respectivamente, valores médios de 204 μSv.a-1 e 393 Bq.kg-1 para solo; 195 μSv.a-1 e 328 Bq.kg-1 para as rochas graníticas e de 20.993 μSv.a-1 e 70.124 Bq.kg-1 para as rochas cálcio-silicáticas anfibolíticas. Além disso, foi estimada a disponibilidade do urânio natural no solo da área com base na razão Th/U. No solo, o urânio apresentou baixa mobilidade (Th/U igual a 4,6) para pelo menos 80% dos pontos amostrados. Os resultados permitiram monitorar a exposição gama externa à qual os indivíduos que residem próximos a essas áreas estão expostos. Estima-se uma taxa de dose máxima superior a 43 vezes o limite recomendado para indivíduos do público, que é de 1 mSv.a-1. Recomenda-se que essas áreas sejam pouco utilizadas ou evitadas, de forma minimizar exposições desnecessárias
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9

Toulhoat, Pierre. « Hydrogeochimie de l'uranium, de ses descendants et d'elements associes (lanthanides) : application a la prospection miniere ». Paris 6, 1987. http://www.theses.fr/1987PA066648.

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On etudie le comportement de l'uranium et de ses descendants dans les eaux naturelles et on quantifie les phenomenes de fixation en presence de complexants en solution. D'autre part, dans un but de prospection, on etudie les traceurs de mineralisations que sont **(234)u et **(206)pb, les phenomenes d'adsorption/desorption gouvernant en grande partie les modeles de prospection proposes, bases sur la mesure des rapports d'activite **(234)u/**(236)u et de la composition isotopique du plomb dans les eaux
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10

Hawa, A. H. [Verfasser], et A. von [Verfasser] Baeckmann. « Simultane Bestimmung von U-235 - und Pu-239 - Spuren durch γ-spektrometrische Analyse der Spaltedelgase nach Neutronenaktivierung / A. H. Hawa, A. von Baeckmann ». Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/1190100649/34.

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11

McGinnis, Jason M. « PROMPT FISSION NEUTRON ENERGY SPECTRUM OF n+235U ». UKnowledge, 2019. https://uknowledge.uky.edu/physastron_etds/63.

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Despite nuclear fission prominence in nuclear physics, there are still several fundamental open questions about this process. One uncertainty is the energy distribution of neutrons emitted immediately after fission. In particular the relative energy distribution of neutrons above 8~MeV has been difficult to measure. This experiment measured the prompt neutron energy spectrum of n+235U from 3-10~MeV. The measurement took place at Los Alamos National Laboratory (LANL) and used a double time-of-flight technique to measure both the beam and fission neutron kinetic energies. Fission event timing was measured with a parallel plate avalanche counter. The fission neutron time-of-flight was measured with 2~m long plastic scintillation detectors. By combining the time-of-flight information with a known flight path the kinetic energy spectrum of neutrons was measured. To eliminate backgrounds various time-of-flight and energy cuts were imposed and an accidental coincidence background was subtracted. An MCNP simulation, including the 2~m neutron detector geometry, was done using the Madland and Nix model as the input energy distribution for the simulated neutrons. Finally, the measured energy spectrum was compared with the MCNP simulated n+235U fission neutron energy spectrum.
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12

VIEIRA, de MORAES MARCO A. P. « Reacoes fotonucleares induzidas por radiacao gama de captura de neutrons, nos nucleos de U-233 e Pu-239, junto ao limiar ». reponame:Repositório Institucional do IPEN, 1990. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10226.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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13

Manna, Alice. « Cattura neutronica su u-238 : Studio della regione delle risonanze risolte ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6644/.

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Le attuali sezioni d’urto di reazioni indotte da neutroni non sono sufficientemente accurate per essere utilizzate in progetti di ricerca di frontiera. Per soddisfare la richiesta di nuovi dati nucleari è stata recentemente costruita al CERN di Ginevra la facility n_TOF (neutron Time Of Flight). Le caratteristiche che contraddistinguono questa facility sono l’elevato flusso istantaneo di neutroni, l’ampio spettro energetico e l’eccellente risoluzione energetica. In questa tesi viene analizzata la sezione d’urto di cattura neutronica su 238U, fondamentale per la realizzazione dei reattori nucleari di nuova generazione che prevedono la sostituzione del combustibile 235U con 238U, molto più abbondante in natura e che permette di ridurre drasticamente l’accumulo di scorie nucleari. Nonostante le numerose misure già effettuate su questo elemento, ancora non si è raggiunta la precisione necessaria per le tecnologie nucleari emergenti quali i reattori di quarta generazione e gli ADS (Accelerator Drive System). Inoltre la parametrizzazione della sezione d’urto in termini di matrice R, non è così accurata quanto richiesto. In questo lavoro si è dapprima studiata l’assegnazione dello spin delle risonanze riportata in letteratura, elemento fondamentale per la successiva analisi delle risonanze e la parametrizzazione della sezione d’urto della reazione 238U(n, ). Parallelamente a questa attività si è studiata la funzione di risposta dello spettrometro n_TOF, che descrive la risoluzione energetica dei neutroni incidenti e va quindi a modificare la forma delle risonanze. I risultati ottenuti sono quindi stati confrontati con quelli in letteratura per poter essere validati e per poter verificare eventuali migliorie.
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14

Crançon, Pierre. « Migration de l'uranium dans un podzol : le rôle des colloïdes dans la zone non saturée et la nappe : application aux landes de Gascogne ». Phd thesis, Grenoble 1, 2001. http://www.theses.fr/2001GRE10006.

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L'uranium est fortement associe aux matieres organiques dans de nombreux sols naturels. U(vi) forme plus particulierement des complexes tres stables avec les acides humiques, pour des conditions acides a neutres. Les acides humiques peuvent se rencontrer dans les systemes naturels en agregats avec les argiles, ou en enrobage de particules minerales. Ces structures sont tres sensibles aux variations de la force ionique du milieu. Cette sensibilite peut etre a l'origine d'une forte remobilisation des substances humiques colloidales du sol, et de leur migration en direction de la nappe phreatique. Dans ce cas, la migration de l'uranium complexe par les substances humiques peut etre grandement facilitee dans le sol. Le transport reactif comparatif de l'uranium total et de ses isotopes a ete etudie dans un site ou de l'uranium metallique est repandu a la surface du sol, dans le podzol des landes de gascogne. L'etude de terrain est completee par une etude experimentale en colonnes. L'evolution temporelle de la concentration totale en uranium et des rapports isotopiques u 2 3 5/u 2 3 8 et u 2 3 3/u 2 3 8 est determinee par icp-ms. Le suivi de la concentration relative en substances humiques est realise par fluorescence uv en ligne. L'etude de terrain montre que la majorite de l'uranium est retenue dans les premiers centimetres du sol. On observe pourtant des concentrations en uranium anormalement elevees dans les eaux souterraines, a plus de 2 kilometres a l'aval des zones contaminees. Ceci montre qu'il existe un processus de transport rapide de l'uranium dans la zone insaturee, et que ce processus assure une migration de l'uranium sur de longues distances. Dans le sol sableux des landes, des colloides naturels argilo-humiques migrent a la vitesse de l'eau, mais peuvent etre retardes lorsque la force ionique des eaux souterraines augmente. On montre que l'uranium est fortement associe a la fraction granulometrique fine (< 8m) du sable, et plus particulierement aux colloides composites argilo-humique. Dans les conditions geochimiques stables des colonnes experimentales, plus de 70% de l'uranium est retenu dans les premiers 2 centimetres de sable, meme apres la circulation de 100 volumes d'eau dans la colonne. Ceci montre la forte capacite de retention de l'uranium du sable des landes. L'ajout de colloides naturels a la solution d'injection favorise la migration de l'uranium. Il apparait qu'entre 5 et 15% de l'uranium total injecte dans les colonnes de sable sont transportes par les colloides argilo-humiques a la vitesse de l'eau. L'utilisation de l'isotope u 2 3 3 permet de realiser la distinction entre l'uranium transporte de facon non reactive a travers le sable, et l'uranium derobe depuis les agregats argilo-humiques et les enrobages des grains du sable. Une diminution brutale de la force ionique du milieu durant les essais de transport montre une remobilisation importante de l'uranium depuis le sol. Lorsque l'on considere les relations complexes entre l'hydrologie et la geochimie dans la zone non saturee du sol, il apparait que le transport de l'uranium est controle par : - les contrastes de force ionique et la vitesse elevee des transferts d'eau dans la partie superieure de la zone insaturee, en reponse a l'infiltration transitoire des lames d'eau de pluie, - l'existence d'une stratification d'acidite et d'oxygene dissous dans le sol, qui determine la speciation de l'uranium et l'efficacite de sa sorption a la surface des mineraux et colloides du sol au dessus de la surface libre de la nappe, - les contrastes geochimiques qui apparaissent lors des remontees de la nappe phreatique.
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15

Bignardi, Aline Moraes Teixeira. « Desenvolvimento de método de recuperação de 131I no processo de produção de 99Mo pela fissão de 235U ». Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-21082013-083347/.

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O 131I é um radioisótopo de iodo amplamente utilizado em medicina nuclear, pode ser utilizado tanto para diagnóstico quanto para tratamento devido às suas características físicas de decaimento - e sua elevada emissão de raios-y. Sua produção no IPEN é realizada utilizando um reator nuclear a partir da reação indireta: 130Te (n,y) 131mTe 131Te 131I, onde são irradiados alvos contendo Te. Pode também ser produzido via produto de fissão de 235U, onde, o 235U irradiado produz cerca de 300 elementos diferentes, entre eles o 131I. O 131I produzido nesse método apresenta altas atividade específica e concentração radioativa, o que facilita a produção de compostos marcados com o radionuclídeo. O objetivo deste trabalho é desenvolver um método de recuperação de 131I no processo de produção de 99Mo pela rota de dissolução ácida de alvos de 235U, com a qualidade necessária para ser utilizado em Medicina Nuclear. O 131I encontra-se em 2 fases no processo, tanto na fase gasosa produzida na dissolução ácida dos alvos de U metálico e a menor parte em solução. Foram utilizados diversos materiais para captura e recuperação de 131I nas 2 fases do processo, a fase gasosa e a solução de dissolução dos alvos de U. Foram testadas colunas de alumina com Cu, alumina ácida com Cu, nanoesferas de Ag, cartuchos aniônicos, resina aniônica, colunas de carvão ativado, microesferas de Ag e microesferas de Cu. Soluções contendo 131I em NaOH 0,1 mol.L-1 foram percoladas pelos materiais e os eluídos foram analisados em calibrador de dose. Foi também estudada a precipitação de AgI e dissolução desse precipitado em NH4OH 0,1 mol L-1 e Na2S2O3 5%. Dentre os testes realizados, a princípio, os resultados de recuperação variaram de acordo com o material, o carvão ativado apresentou rendimento de recuperação entre 42% a 83%. Já o rendimento de recuperação da coluna de alumina com Cu variou de 20% a 85%. Os testes com nanoesferas de Ag apresentaram rendimento de recuperação de 26% utilizando NaOH 0,1 mol L-1 e 72% utilizando Na2S2O3 como eluentes. Testes com cartuchos aniônicos apresentaram os melhores resultados com uma porcentagem de recuperação de 81 a 90%. Testes utilizando 131I na sua forma gasosa apresentaram uma retenção de 66,45% e não foram realizados testes para recuperação do 131I retido. Nos testes utilizando precipitação de AgI a porcentagem de retenção de 131I foi de 100%. É possível concluir que os cartuchos aniônicos e a precipitação de AgI foram as melhores opções para a retenção de 131I, e as colunas de alumina com Cu tem um grande potencial para eluição do radionuclídeo 131I na forma química adequada.
131I is an iodine radioisotope widely used in nuclear medicine that can be used either for diagnostic or for treatment due to its physical decay by - and its high emission of -rays. It is produced at IPEN using the indirect reaction: 130Te(n,)131mTe 131Te 131I where TeO2 targets are irradiated in a Nuclear Reactor. There is also the possibility of producing 131I by the fission of 235U, where about 300 different elements are produced together with 131I. The 131I produced through this method presents high specific activity and radioactive concentration suitable for the labeling of molecules. The aim of this work was to develop a recovery method of 131I with the required quality to be used in Nuclear Medicine in the 99Mo production process through the route of acid dissolution of metallic 235U targets. 131I can appear in two phases of the process, both in the gaseous phase produced during the dissolution of metallic U targets and in the dissolution solution. This work studied the recovery of 131I in these two phases. Several materials were used for the capture and recovery of 131I at the two phases of the process, the gaseous one and the solution of dissolution of U targets. Columns of alumina with Cu, acid alumina with Cu, Ag microspheres, Cu microspheres, Ag nanospheres, anionic cartridges, Ag cartridges, anion exchange resin and activated charcoal columns were tested. Solutions containing 131I in 0.1 mol.L-1 NaOH were percolated through the materials and the eluted solutions were analyzed in a dose calibrator. The precipitation of AgI was also studied wth further dissolution of this precipitate with 0.1 mol L-1 NH4OH and 5% Na2S2O3. The recovery results varied according to the material, activated charcoal showed recovery yields between 42% and 83% but the recovery yield of the alumina column with Cu ranged from 20% to 85%. Tests with Ag nanospheres showed recovery yield of 26% using 0.1 mol L-1NaOH and 72% for Na2S2O3. Tests with anionic cartridges showed the best results with a recovery percentage ranging between 81 to 90%. Tests using 131I in the gaseous phase presented retention of 66.45% and its elution was not studied. The experiments with the AgI precipitation showed total retention of 131I. It can be concluded that the anionic cartridges and the precipitation of AgI have higher affinity for the retention of 131I, and alumina columns with Cu have great potential for its elution in a suitable chemical form.
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Lapa, Flávia Valverde. « Evolução temporal das distribuições dos radionuclídeos naturais U-238, Th-234, Ra-226, Ra-228, Pb-210 e Po-210 no estreito de Bransfield, Peninsula Antártica ». Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-04072013-173212/.

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Pesquisas versando sobre a distribuição de radionuclídeos naturais na Antártica são raras e desta forma, há grande interesse em se conhecer sua ocorrência e os fatores envolvidos com sua mobilização, transferência e acúmulo neste ambiente extremamente frágil. Os radionuclídeos naturais têm sido intensamente utilizados como traçadores no meio ambiente oceânico, auxiliando na compreensão de processos como afundamento, remoção e ressuspensão de partículas, mistura de massas dágua e circulação oceânica. O 234Th (t½ = 24,1 dias) é um radionuclídeo partículo-reativo produzido continuamente na água do mar pelo decaimento radioativo de seu precursor solúvel e de caráter conservativo com a salinidade 238U (t½ = 4,5 109 anos). Como apresenta meiavida relativamente curta, o 234Th é apropriado para quantificar processos que ocorrem em escala de tempo de dias a semanas. O desequilíbrio 234Th/ 238U nas águas superficiais do oceano tem sido utilizado para determinar o fluxo de carbono orgânico que afunda via material particulado. O fluxo de partículas produtivas biologicamente para além da zona eufótica no Oceano Austral tem destaque especial devido à sua importância no controle das concentrações de CO2 na atmosfera. Os radionuclídeos 210Pb (t½ = 22,3 anos) e 210Po (t½ = 138 dias) também são partículo-reativos. O desequilíbrio 210Po/ 210Pb tem sido utilizado para estimar os fluxos de partículas exportadas no oceano em uma escala de tempo de várias semanas. Os isótopos de Ra de meias-vidas longas, 226Ra (t½ = 1.600 anos) e 228Ra (t½ = 5,75 anos) são solúveis na água do mar exibem propriedades únicas que os tornam bons traçadores de massas dágua. Este trabalho teve por objetivos estudar as distribuições dos radionuclídeos naturais 238U, 234Th, 226Ra, 228Ra, 210Pb e 210Po no Estreito de Bransfield, durante duas campanhas realizadas no Verão Austral de 2011 (OPERANTAR XXIX e XXX).
Research on the distribution of natural radionuclides in Antartica is rare and thus, there is great interest in to know their occurrence and factors related to its mobilization, transference and accumulation in this extremely fragile environment. Natural radionuclides have been used intensively as tracers in the ocean, helping to better understand processes as sinking and particle ressuspention, water masses mixture and oceanic circulation. 234Th (t½ = 24.1 days) is a particle-reactive radionuclide produced continuously in seawater by the decay of its soluble precursor conservative with salinity 238U (t½ = 4.5 109 years). Since 234Th presents relatively short half-life, it is used to quantify processes that occur in temporal scale varying from days to weeks. The disequilibrium 234Th/ 238U in the surface ocean has been applied to estimate carbon fluxes exported via sinking material. The flux of particles biologically productive out of the euphotic zone in the Southern Ocean has special attention due to its importance in the control of CO2 atmospheric concentrations. The radionuclides 210Pb (t½ = 22.3 years) and 210Po (t½ = 138 days) are also particle-reactive. The disequilibrium 210Po/ 210Pb has been used to estimate fluxes of particles exported in the ocean in the time scale of weeks. The long-lived Ra isotopes, 226Ra (t½ = 1,600 years) and 228Ra (t½ = 5.75 years) are soluble in seawater, presenting unique properties that make them excellent tracers of water masses. This research work had the aim to study the distributions of natural radionuclides 238U, 234Th, 226Ra, 228Ra, 210Pb and 210Po in the Bransfield Strait during 2 samplings carried out in the 2011 Austral Summer (OPERANTAR XXIX and XXX).
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LAPA, FLAVIA V. « Evolução temporal das distribuições dos radionuclídeos naturais U-238, Th-234, Ra-226, Ra-228, Pb-210 e Po-210 no estreito de Bransfield, Península Antártica ». reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10209.

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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Wöstheinrich, Marcus. « Emission von ternären Teilchen aus den Reaktionen 229 Th(n th ,f), 233 U(n th ,f) und 239 Pu(n th ,f) ». [S.l. : s.n.], 1999. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8496975.

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Schuette, R. [Verfasser], et H. [Verfasser] Steinhaus. « Methodik der Stoerungsdiagnose in Trennduesenkaskaden zur U-235-Anreicherung / R. Schuette, H. Steinhaus ». Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/1190100533/34.

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Seidel, D. [Verfasser], et U. [Verfasser] Sieber. « Die Betriebsgrenzen einer technischen Trennduesenstufe zur Anreicherung von Uran 235 / D. Seidel, U. Sieber ». Karlsruhe : KIT-Bibliothek, 2012. http://d-nb.info/1190100665/34.

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d'Avila, Ronald L. « Anharmonic effects on the resonance line shape of U-238 in UO[subscript]2 ». Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/15703.

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DAMATTO, SANDRA R. « Radionuclideos naturais da series do sup(238)U e sup(232)Th, elementos traco e maiores determinados em perfis de sedimento da Baixada Santista para avaliacao de areas impactadas ». reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9574.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Siegel, Greg Grossberg Lawrence. « Technologies of accident forensic media, crash analysis, and the redefinition of progress / ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2005. http://dc.lib.unc.edu/u?/etd,235.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Communication Studies." Discipline: Communication Studies; Department/School: Communication Studies.
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Peter, Geoffrey J. M. « Numerical simulation of CTE mismatch and thermal-structural stresses in the design of interconnects / ». Full text open access at:, 2001. http://content.ohsu.edu/u?/etd,235.

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Murray, Elizabeth. « Measurement of prompt gamma-ray energy distribution and multiplicity of U-235 following thermal fission using STEFF ». Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/measurement-of-prompt-gammaray-energy-distribution-and-multiplicity-of-u235-following-thermal-fission-using-steff(237a3928-95a1-4a5f-b905-44ad23368f98).html.

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More accurate knowledge of gamma-ray heating in nuclear reactors has beenlisted as a high priority request by the NEA [23]. In response to this the SpecTrometerfor Exotic Fission Fragments (STEFF), a 2-velocity, 2-energy spectrometer assembledby the Manchester Fission Group has been used to take measurements ofprompt gamma-rays from thermal fission of U-235. Through the procedures discussed,the average total gamma-ray energy and average multiplicity were determined to be8.40 +/- 0.26 MeV and 7.74 +/- 0.12, respectively. The single energy spectrum for eachindividual detector has been determined as well as the total energy distribution. A new parallel plate avalanche counter has been tested for its potential to improvethe timing resolution of the current STEFF stop detector. The timing resolution ofthe new detector is found to be 337 ps, an improvement of 75 % on the previous stopdetector. The pulse shapes created by a fission fragment in an ionisation chamber havebeen investigated. The relationship with fragment atomic number has been tested byemploying the Lohengrin spectrometer to separate fragments by mass so that theirindividual pulse shapes can be studied. Evaluation work has been performed at the NNL, Cumbria, under the supervisionof Dr Robert Mills. Experimental data determined from the spontaneous fission ofCf-252 has been extracted and evaluation techniques performed upon it so that thedata can be considered for inclusion within an evaluated nuclear database.
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Boyer, Sebastien. « Dans le cadre du nouveau cycle de combustible $^(232)$Th/$^(233)$U, determination de la section efficace de capture radiative $^(233)$Pa(n,$\gamma$) pour des energies de neutrons comprises entre 0 et 1 MeV ». Phd thesis, Université Sciences et Technologies - Bordeaux I, 2004. http://tel.archives-ouvertes.fr/tel-00009062.

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Dans l'optique d'un developpement durable du nucleaire, un des themes de recherche du CNRS dicte par la loi Bataille de 1991, est l'etude d'une nouvelle filiere nucleaire utilisant un combustible a base de minerai de thorium ($^(232)$Th) ou le noyau fissile est l'$^(233)$U. Le principal interet de ce type de combustible reside dans sa particularite de produire les dechets transuraniens en beaucoup plus faible quantite que les reacteurs a eau pressurisee actuels. Cependant certaines donnees nucleaires importantes concernant cette nouvelle filiere sont tres mal connues comme par exemple celles relatives au noyau charniere protactinium 233 ($^(233)$Pa). Sa periode de 27 jours lui confere un role particulier dans le cycle mais en raison de sa trop forte activite l'etude de ce noyau releve du defi experimental. Pour contourner cette difficulte, la probabilite d'emission de rayonnements gamma dans la reaction induite par neutrons $^(233)$Pa(n,$\gamma$) entre 0 et 1 MeV d'energie neutron a ete determinee a partir de la reaction transfert $^(232)Th(^(3)He,p)^(234)Pa*$. Le dispositif de mesure permettait d'identifier la particule de sortie signant ainsi la voie de reaction tandis que des scintillateurs de type C$_(6)$D$_(6)$ permettaient la detection en coincidence des rayonnements gamma emis. La methode d'analyse des evenements gamma a necessite la ponderation des spectres de photons par des fonctions mathematiques calculees dites "fonctions de poids". leurs determinations requierent neanmoins une connaissance parfaite du comportement des scintillateurs (efficacite, fonctions de reponse) dans la geometrie choisie. Pour ce faire, une etude preliminaire a ete realisee a l'aide de sources gamma et avec des reactions induites par protons sur des noyaux legers. Les simulations utilisant le code de transport MCNP ont ete validees par des resultats experimentaux.
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Luque, Jackeline. « Exocellular polymeric substances, bioflocculation and sludge settling properties in a combined anaerobic/activated sludge process ». ScholarWorks@UNO, 2005. http://louisdl.louislibraries.org/u?/NOD,238.

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Dissertation (Ph. D.)--University of New Orleans, 2005.
Title from electronic submission form. "A thesis ... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Engineering and Applied Science"--Dissertation t.p. Vita. Includes bibliographical references.
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Low, Kok-Lim Lastra Anselmo. « View planning for range acquisition of indoor environments ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,238.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Computer Science." Discipline: Computer Science; Department/School: Computer Science.
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Patterson, Brian Clay. « Viologen-mediated electron transfer across dihexadecylphosphate bilayer membranes / ». Full text open access at:, 1990. http://content.ohsu.edu/u?/etd,238.

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Sander, Anika [Verfasser], et Thomas [Akademischer Betreuer] Fanghänel. « Entwicklung und Untersuchung U-230 markierter Antikörper / Anika Sander ; Betreuer : Thomas Fanghänel ». Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/1180499336/34.

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CRUZ, ROSANA PETINATTI DA. « DEVELOPMENT OF A METHODOLOGY FOR CORALS AND SPELEOTHEMS DATING USING THE 230-TH/234-U METHOD, THROUGH CHROMATOGRAPHIC SEPARATION AND QUANTIFICATION BY ALPHA SPECTROMETRY AND FIA-ICP-MS ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8544@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
O presente trabalho aborda as determinações de idades de espeleotemas e corais, usando o método de desequilíbrio da série urânio, mais especificamente, o método de deficiência de filhos daughter deficient DD, em particular o método 230Th/234U. Foram testadas diferentes metodologias empregando separação por extração cromatográfica e quantificação por espectrometria alfa e ICP-MS. Foram testados três procedimentos diferentes: separação em batelada empregando-se colunas com Tri-octil óxido de fosfina (TOPO) em silica- gel e a coluna TRU comercializada pela Eichrom(R), composta de octil-N,N,- isobutil carbamoil óxido de fosfina dissolvido em fosfato de tributila (TBP) e quantificação por espectrometria alfa; separação em batelada com os mesmos sistemas mas quantificação por ICP-MS e separação em linha (flow injection) com cartuchos de TRU e quantificação por ICP-MS. As metodologias desenvolvidas foram validadas empregando-se amostras de referência certificada, IAEA-327 (solo) tendo sido obtidas incertezas de 2% para o método empregando a separação em linha (flow injection) com cartuchos de TRU e quantificação por ICP-MS. As amostras de espeleotema analisadas foram coletadas no Carste de Lagoa Santa, MG, pelo grupo do Prof. Luis Piló (USP) e suas idades variaram de 15,2±2,2 kanos a >350 kanos. Estes valores estão na faixa dos valores encontrados na literatura para amostras de espeleotema coletadas pelo mesmo grupo na mesma região. A amostra de coral, coletada na Bacia de Campos (RJ) era da espécie Lophelia pertusa, foi subdividida segundo suas ramificações (primária, secundária e terciária) e o ramo principal foi datado em 9,4 ± 0,3 kanos.
This paper discusses the age determination of speleothems and corals using Uranium-series- imbalance method, more specifically the daughter deficient method - DD, particularly the 230Th/234U method. Different methodologies were tested using chromatographic extraction separation and quantification by alpha spectrometry and ICP-MS. Three different procedures were tested: batch separation using columns with Tri-N-Octylphosphine Oxide (TOPO) in silica gel and TRU column commercialized by Eichrom(R) composed of octyl-N,N,-isobutyl carbamoylphosphine oxide dissolved in tri-n-butyl phosphate (TBP) and with quantification by alpha spectrometry; batch separation with the same systems, but with quantification by ICP-MS; and flow injection with TRU cartridges and qualification by ICP-MS. The methodologies developed were verified using certified reference samples, IAEA-327 (soil) with 2% imprecision rate for the method using flow injection with TRU cartridges and qualification by ICP-MS. The speleothem samples analyzed were collected at Carste de Lagoa Santa, in the state of Minas Gerais, by Prof. Luis Piló`s (USP) group, and their ages varied from 15,2±2,2 kyears to >350 kyears. These numbers are within the range found in the literature for speleothem samples collected by the same group in the same region. The coral sample, collected at Bacia de Campos (RJ), and from the Lophelia pertusa species, was subdivided according to its ramifications (primary, secondary and tertiary), and the main ramification dated 9,4 ± 0,3 kyears.
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Schuette, R. [Verfasser]. « Das gasdynamische Betriebsverhalten und die Kriterien der inhaerenten Stabilitaet von Trennduesenkaskaden zur U-235-Anreicherung / R. Schuette ». Karlsruhe : KIT-Bibliothek, 2010. http://d-nb.info/1187252964/34.

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MAIDANA, NORA L. « Medidas de seccoes de choque medias no espectro de fissao do U-235 para algumas reacoes de limiar ». reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10314.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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34

Ham, Bryan Melvin. « Development of mass spectrometric methods for the analysis of components and complex interactions in biological systems ». ScholarWorks@UNO, 2005. http://louisdl.louislibraries.org/u?/NOD,237.

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Thesis (Ph. D.)--University of New Orleans, 2005.
Title from electronic submission form. "A dissertation ... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry"--Dissertation t.p. Vita. Includes bibliographical references.
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Xie, Weiqiao Hope Lila W. « Isolation and characterization of a gene required for peroxisome biogenesis ». Oregon Health & ; Science University, 1993. http://content.ohsu.edu/u?/etd,234.

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M.S.
Molecular Biology
This thesis describes the cloning and analysis of PER6, a gene required for peroxisome biogenesis in Pichia pastoris. The gene was cloned by functional complementation of a per6 P. pastoris mutant strain that was one of a number of peroxisome-deficient mutants isolated in this laboratory. The complementing activity was localized to a small DNA fragment by subcloning and Northern filter hybridization analysis and the DNA sequence of the fragment was determined. The sequence revealed a 1296-bp open reading frame which potentially encodes a 432-amino acid protein of 49 kD. The gene was transcribed into a message of 1.4 kilobases that was constitutively expressed but induced several-fold in cells growing on methanol. A mutant strain with a deletion of a large portion of the open reading frame was constructed and used to genetically demonstrate that the cloned gene was identical to the defective gene in the originally isolated per6 mutant. The predicted amino acid sequence of the PER6 product revealed several interesting features, including a significant regional similarity to PAF-1, a gene known to be defective in some patients with Zellweger syndrome, a lethal human genetic disease caused by peroxisome deficiency. Finally, the PER6 product was produced in E. coli and purified to serve as antigen for antibody production.
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Obinwa, Ignatius M. C. « The Universal Church and a Wider Notion of the Domestic Church : Approaching Ecumenism from the African Extended Family System ». Bulletin of Ecumenical Theology, 2011. http://digital.library.duq.edu/u?/bet,230.

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Hyde, Nate. « Towards national estuarine modeling and characterization/classification systems : a pilot study for Coos Bay / ». Full text open access at:, 2007. http://content.ohsu.edu/u?/etd,233.

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Moffitt, Theodore Paul. « Compact fiber-optic diffuse reflection probes for medical diagnostics / ». Full text open access at:, 2007. http://content.ohsu.edu/u?/etd,232.

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Rojnkureesatien, Kriengsak Walsh Stephen J. « Geographical accessibility and land-use and land-cover dynamics the case of Nang Rong district, northeast Thailand / ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,236.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Geography." Discipline: Geography; Department/School: Geography.
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Hill, Mary Ph D. Shaw Donald Lewis. « Tell me a story how narratives shape reporters' ethics / ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2005. http://dc.lib.unc.edu/u?/etd,237.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the School of Journalism and Mass Communication." Discipline: Journalism and Mass Communication; Department/School: Journalism and Mass Communication, School of.
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Weber, Todd Jack Dean James W. « Performance oriented cross-cultural management research examining the impact of national culture on the practice-performance relationship / ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,239.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Kenan-Flagler School of Business Administration." Discipline: Business Administration; Department/School: Business School, Kenan-Flagler.
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Luciano, Mariola Overman Vickie P. « Survey of oral health practices among adults in a North Carolina Hispanic population ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,230.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Masters of Science in Dental Hygiene Education in the department of Dental Ecology (School of Dentistry)." Discipline: Dental Ecology; Dental Hygiene Education; Department/School: Dentistry.
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Gaylord, Meredith Zajac David. « Temporal characteristics of alveolar stop consonants produced by children with varying levels of velopharyngeal dysfunction ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,231.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Allied Health Sciences, Division of Speech and Hearing Sciences." Discipline: Allied Health Sciences; Speech and Hearing Sciences; Department/School: Medicine.
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Wojczynski, Mary K. North Kari E. « Characteristics of the co-morbidity of irritable bowel syndrome a secondary analysis of existing twin data / ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,232.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirement for the degree of Doctor of Philosophy in the Department of Epidemiology, School of Public Health." Discipline: Epidemiology; Department/School: Public Health.
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Rentz, Ericka Danielle Marshall Stephen William. « Child abuse and neglect in military and non-military families an analysis of the National Child Abuse and Neglect Data System, 2000-2003 / ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,233.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Epidemiology, School of Public Health." Discipline: Epidemiology; Department/School: Public Health.
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Hsu, Ronald Hsien-Jung Trotman Carroll-Ann. « Recruitment of dentists by military services implications for academia / ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,234.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2006.
Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Master of Science in the School of Dentistry (Pediatric Dentistry)." Discipline: Pediatric Dentistry; Department/School: Dentistry.
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Ramaswamy, Murali T. « Heat affected zone studies of thermally cut structural steels / ». Full text open access at:, 1989. http://content.ohsu.edu/u?/etd,236.

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Wang, Xihong. « Wear behavior of PVD titanium nitride-coated tool steels / ». Full text open access at:, 1989. http://content.ohsu.edu/u?/etd,237.

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Menaia, Jose Antonio Gomes Ferreira. « Osmotics of halophilic methanogenic archaeobacteria / ». Full text open access at:, 1992. http://content.ohsu.edu/u?/etd,239.

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Xie, Weiqiao. « Isolation and characterization of a gene required for peroxisome biogenesis / ». Full text open access at:, 1993. http://content.ohsu.edu/u?/etd,234.

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