Dissertations / Theses on the topic 'Quartz; Thermoluminescence dating; Thermoluminescence'
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韓志勇 and Zhiyong Han. "Thermoluminescence dating of granitic quartz." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31238555.
Full textHan, Zhiyong. "Thermoluminescence dating of granitic quartz /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21583766.
Full textChen, Yongye. "Study of luminescence signals from quartz and their applications in geothermometry." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/b40203955.
Full textChen, Geng, and 陳耿. "Studies of quartz luminescence sensitivity relevant to dating and dosimetry." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B42576143.
Full textChen, Geng. "Studies of quartz luminescence sensitivity relevant to dating and dosimetry." Click to view the E-thesis via HKUTO, 2000. http://sunzi.lib.hku.hk/hkuto/record/B42576143.
Full textChen, Yongye, and 陳永曄. "Study of luminescence signals from quartz and their applications in geothermometry." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40203955.
Full textZhao, Hui, and 趙暉. "Studies of isochron luminescence dating with sand-sized grains." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42577329.
Full textZhao, Hui. "Studies of isochron luminescence dating with sand-sized grains." Click to view the E-thesis via HKUTO, 2002. http://sunzi.lib.hku.hk/hkuto/record/B42577329.
Full textMcFee, Christopher James. "The use of an imaging photon detector for luminescence dating." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296940.
Full textSalmazo, Giovana Oliveira [UNESP]. "Caracterização das propriedades termoluminescentes de sedimentos da formação geológica Rio Claro." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/91988.
Full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A formação geológica Rio Claro constitui um dos mais importantes registros sedimentares cenozóicos da Depressão Periférica Paulista. Apesar de essa formação geológica ser muito estudada, sua idade ainda encontra-se indeterminada. De modo a contribuir aos conhecimentos sobre a formação geológica Rio Claro, o trabalho objetivou um estudo geocronológico de seus sedimentos. Para isso, foram estudas cinco amostras sedimentares coletadas de pontos arbitrários da formação geológica, as quais foram denominadas de DSRC- 09, DSRC-10, DSRC-21, DSRC-22 e DSRC-23, e caracterizadas pela técnica da termoluminescência (TL). Grãos de quartzo de diâmetros entre 75 a 180 μm foram utilizados na caracterização. As amostras apresentaram sinal de termoluminescência natural entre 200 e 450 °C. Com exceção da amostra DSRC 22, todas as amostras apresentaram região de Plateau, que indica a região da curva de emissão que se manteve estável durante o período geológico a temperatura ambiente. A região de Plateau de DSRC-09, DSRC-10, DSRC 21 e DSRC-23 compreendeu o intervalo de temperatura de 320 a 380 °C. Pelo método Tm-Tstop se observou a presença de três picos constituindo a curva de emissão termoluminescente nessa região de temperatura. O nível residual da TL foi obtido após 80 horas de exposição dos grãos de quartzo à luz solar. Os sedimentos apresentaram não estar saturados, pois a intensidade do sinal TL aumentou em função de dose adicional artificial. Para a avaliação da idade dos sedimentos, o pico de 325 °C foi isolado e a energia de ativação foi calculada pelo método de crescimento inicial. As idades de deposição obtidas para as amostras DSRC-09, DSRC-10 e DSRC-21 foram respectivamente de 188.000 anos, 210.000 anos e 166.000 anos.
The geological formation Rio Claro constitutes one the most important sedimentary records of São Paulo Peripheral Depression. Although this geological formation is too much studied, its age yet is not determinate. To contribute to knowledge about Rio Claro geological formation, the work aimed a geocronological study of its sediments. For this, five sedimentary samples collected from arbitrary points were studied, which were called DSRC-09, DSRC-10, DSRC- 21, DSRC-22 and DSCR 23, and characterized by thermoluminescence technique. Grains of quartz with diameter between 75 and 180 μm were utilized to characterize it. The samples showed natural thermoluminescence signal between 200 and 450 °C. Except for the sample DSRC 22, all samples showed Plateau region, indicating that the region of glow curve remained stable during the geological time at environment temperature. Plateau region of DSRC-09, DSCR-10, DSRC-21 and DSRC-23 was defined by temperature range of 320 °C to 380°C. The method Tm-Tstop showed that the glow curves are composed by tree peaks in this temperature range. The residual TL was obtained after 80 hours of sunlight exposure. The sediments had not been saturated, because the TL signal intensity increased according to the artificial additional dose. For evaluation of the age sediments, the 325 °C peak was isolated and the activation energy was calculated by the method initial rise. The deposition ages for the samples DSRC-09, DSRC-10 and DSRC-21were respectively 188.000, 210.000 and 166.000 years.
Salmazo, Giovana Oliveira. "Caracterização das propriedades termoluminescentes de sedimentos da formação geológica Rio Claro /." Ilha Solteira : [s.n.], 2009. http://hdl.handle.net/11449/91988.
Full textBanca: Ana Maria Osório Araya Balan
Banca: Sonia Hatsue Tatumi
Resumo: A formação geológica Rio Claro constitui um dos mais importantes registros sedimentares cenozóicos da Depressão Periférica Paulista. Apesar de essa formação geológica ser muito estudada, sua idade ainda encontra-se indeterminada. De modo a contribuir aos conhecimentos sobre a formação geológica Rio Claro, o trabalho objetivou um estudo geocronológico de seus sedimentos. Para isso, foram estudas cinco amostras sedimentares coletadas de pontos arbitrários da formação geológica, as quais foram denominadas de DSRC- 09, DSRC-10, DSRC-21, DSRC-22 e DSRC-23, e caracterizadas pela técnica da termoluminescência (TL). Grãos de quartzo de diâmetros entre 75 a 180 μm foram utilizados na caracterização. As amostras apresentaram sinal de termoluminescência natural entre 200 e 450 °C. Com exceção da amostra DSRC 22, todas as amostras apresentaram região de Plateau, que indica a região da curva de emissão que se manteve estável durante o período geológico a temperatura ambiente. A região de Plateau de DSRC-09, DSRC-10, DSRC 21 e DSRC-23 compreendeu o intervalo de temperatura de 320 a 380 °C. Pelo método Tm-Tstop se observou a presença de três picos constituindo a curva de emissão termoluminescente nessa região de temperatura. O nível residual da TL foi obtido após 80 horas de exposição dos grãos de quartzo à luz solar. Os sedimentos apresentaram não estar saturados, pois a intensidade do sinal TL aumentou em função de dose adicional artificial. Para a avaliação da idade dos sedimentos, o pico de 325 °C foi isolado e a energia de ativação foi calculada pelo método de crescimento inicial. As idades de deposição obtidas para as amostras DSRC-09, DSRC-10 e DSRC-21 foram respectivamente de 188.000 anos, 210.000 anos e 166.000 anos.
Abstract: The geological formation Rio Claro constitutes one the most important sedimentary records of São Paulo Peripheral Depression. Although this geological formation is too much studied, its age yet is not determinate. To contribute to knowledge about Rio Claro geological formation, the work aimed a geocronological study of its sediments. For this, five sedimentary samples collected from arbitrary points were studied, which were called DSRC-09, DSRC-10, DSRC- 21, DSRC-22 and DSCR 23, and characterized by thermoluminescence technique. Grains of quartz with diameter between 75 and 180 μm were utilized to characterize it. The samples showed natural thermoluminescence signal between 200 and 450 °C. Except for the sample DSRC 22, all samples showed Plateau region, indicating that the region of glow curve remained stable during the geological time at environment temperature. Plateau region of DSRC-09, DSCR-10, DSRC-21 and DSRC-23 was defined by temperature range of 320 °C to 380°C. The method Tm-Tstop showed that the glow curves are composed by tree peaks in this temperature range. The residual TL was obtained after 80 hours of sunlight exposure. The sediments had not been saturated, because the TL signal intensity increased according to the artificial additional dose. For evaluation of the age sediments, the 325 °C peak was isolated and the activation energy was calculated by the method initial rise. The deposition ages for the samples DSRC-09, DSRC-10 and DSRC-21were respectively 188.000, 210.000 and 166.000 years.
Mestre
Lontsi, Sob Aaron Joel. "Thermoluminescence of natural quartz." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013358.
Full textNiyonzima, Pontien. "Thermoluminescence characteristics of synthetic quartz." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013190.
Full textAtang, Elizabeth Fende Midiki. "Thermoluminescence of annealed synthetic quartz." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/420.
Full textTempler, R. H. "Thermoluminescence techniques for dating zircon inclusions." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376953.
Full textEs, Hendrickje Jacoba van. "Thermoluminescence dating of sediments using mineral zircon." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2008. http://irs.ub.rug.nl/ppn/308380185.
Full textSpooner, Nigel Antony. "The effect of light on the thermoluminescence of quartz /." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09SM/09sms764.pdf.
Full textFox, Phillip James. "Optical studies of thermoluminescent materials /." Title page, contents and summary only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phf793.pdf.
Full textZhou, Li-Ping. "Thermoluminescence dating and environmental magnetism of loess from China." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239183.
Full textFattahi, Morteza. "Studies on red thermoluminescence and infrared stimulated red luminescence." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246618.
Full textWheeler, G. C. W. S. "Luminescence studies relevant to archaeological dating." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670305.
Full textHochman, Mark Brett McEwen. "The application of artificial thermoluminescence to uranium exploration and uranium ore genesis studies." Title page, abstract and contents only, 1989. http://web4.library.adelaide.edu.au/theses/09PH/09phh6825.pdf.
Full textSpooner, Nigel A. "The validity of optical dating based on feldspar." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:79041fc9-be84-4330-8142-b3766cb932c7.
Full textJungner, Högne. "Thermoluminescence dating in archaeology and geology in Finland comparison with results from radiocarbon dating /." Hki : Societas scientiarum Fennica : Academic Bookstore [distr.], 1987. http://catalog.hathitrust.org/api/volumes/oclc/57779283.html.
Full textMthwesi, Zuko. "Thermoluminescence of synthetic quartz annealed beyond its second phase inversion temperature." Thesis, Rhodes University, 2017. http://hdl.handle.net/10962/46077.
Full textLuiz, Juliet C. "Comparative thermoluminescence dating of Quaternary North American obsidians and crystalline lavas." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/MQ36368.pdf.
Full textSanderson, D. C. W. "Thermoluminescence dating of Scottish vitrified forts : development, evaluation and demonstration of the potential of thermoluminescence dating techniques to resolve outstanding chronological problems associated with Scottish vitrified forts." Thesis, University of the West of Scotland, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376105.
Full textWong, Wai-leung Nelson. "Thermal stability of luminescence signals relevant to dating /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19471129.
Full textParks, D. A. "TL dating and geochemistry of brickearths in S.E. England." Thesis, University of Sussex, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282705.
Full textWong, Wai-leung Nelson, and 王韋良. "Thermal stability of luminescence signals relevant to dating." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31220137.
Full textZhang, Jiafu. "Development and application of luminescence dating to quaternary sediments from China." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22266628.
Full textIvaldi, Jean-Pierre. "Thermoluminescence et orogenèse. Les Alpes occidentales au Paléogène." Phd thesis, Université de Nice Sophia-Antipolis, 1989. http://tel.archives-ouvertes.fr/tel-00690610.
Full text張家富 and Jiafu Zhang. "Development and application of luminescence dating to quaternary sediments from China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31242662.
Full textPucillo, Kevin. "Quaternary palaeochannel evolution and groundwater movement in the Coleambally Irrigation District of New South Wales." School of Earth and Environmental Sciences - Faculty of Science, 2005. http://ro.uow.edu.au/theses/406.
Full textNyirenda, Angel Newton. "Mechanisms of luminescence in α-Al₂O₃:C : investigations using time-resolved optical stimulation and thermoluminescence techniques." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1002961.
Full textFarias, Thiago Michel de Brito. "Estudo das propriedades termoluminescentes e de absorção óptica de oito variedades de quartzo." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-15042009-165630/.
Full textThermoluminescence and optical absorption properties of seven varieties of natural Brazilian quartz, namely, blue, sulphurous, milky, pink, green, red and black quartzs, have been investigated. For comparasion measurements were carried out also on natural alpha and synthetic quartz. Since gemological amethyst and citrine have been studied by several authors, they were not included in this work. The X Ray diffraction analysis has shown that all seven varieties of quartz have a same crystal structure of a standard sample. X Ray fluorescence and Plasma Mass Spectrometry (ICP-MS) analysis reveal Al2O3 and Na2O in all the quartz in fairly large amount, wich are essential in TL emission. Ca, Zn, Ba and Zr are also found in all the quartz samples, however several previous studies of silicate minerals indicated that they do not participate in the physical properties investigated. It is commonly known that a natural alpha quartz presents in its glow curve, 110, 220 and 325°C (sometimes replaced by 375°C) peaks. Except for 110°C peak, the two others are found is some variety but not in others. No explanation was found yet. The shape of glow curves also vary considerably from one variety to others. A striking result was obtained concerning TL response as function of radiation dose of 220°C (245°C in black quartz) and 325°C peaks. The linearsupralinear- sublinear, commonly observed in alkali halides, oxides, sulphates, etc. crystals are not observed in quartz samples except for 220°C peak in blue quartz and hyaline quartz. If linear and supralinear behavior are called first and second stage, the third stage in many of them is not sublinear, rather it keeps growing. In some cases, the first and second stages are strongly supralinear, sulphurous such as in quartz and pink quartz . In alkali halide crystal, for instance, the second stage is due to anion vacancy generated by radiation. In quartz it is due to generation of oxygen vacancy. For the third stage it is proposed that the radiation creates new oxygen vacancy in the group of SiO4 tetrahedron generating oxygen vacancy for the second stage. In the literature, one finds Ge being responsible for production of 110°C peak. The ICP-MS measurements has shown that Ge is found in all the varieties seven quartz, except in sulphurous one, but in less that 2 ppm concentration. Furthermore it was found that the 110°C peak intensity, in these quartz, has no correlation to Ge concentration, the 110°C peak has a huge intensity. Therefore, it is proposed that the oxygen removed from its normal site ends up in an intersticial position as neutral oxygen. The irradiation liberating e-h pairs enable intersticial oxygen to capture electron and became O- centre. This is the source of 110°C peak. The optical absorption spectra of alpha quartz, particularly of heavily irradiated one, show bands at 620, 450 and 350nm. They were attributed to aluminum. Similar result was found in alpha quartz, but the synthetic one with a comparable concentration of aluminum as in the natural alpha quartz did not present such bands, even after irradiation to 20 to 25kGy gamma rays. It was concluded that 620, 450 and 350nm bands are not due to aluminum. It was not found the impurities responsible for there bands. In conclusion, the seven varieties investigated, present quite different behaviour. Compared to that of the usual nature alpha quartz.
Yukimitu, Keizo. "Eletrodifusão, absorção óptica e termoluminescência no quartzo e berilo." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/43/43131/tde-13092013-112622/.
Full textA system of electrodiffusion was made in the laboratory to investigate effects of exchanging alkali ions, usually present in the structural channels by protons, in the optical and thermoluminescent properties of quartz. In the initial part of heating, the sweeping current presents a peak at about 350 GRAUS C. The analysis of the behaviour of this peak with additional data of optical absorption in the region of infrared, it was concluded that the peak at 350 GRAUS C of the current is due to [AL POT. 3+/M POT. +] system. Thermoluminescence and optical absorption spectra in the visible and ultraviolet light region for swept and unswept quartz were compared. Based on this comparison it was shown that, once irradiated to gama- or X-rays, alkali ions are removed from [AL POT. 3+/ M POT. +] and either couple to o ions or capture electron and become interstitial alkali atom, leaving, further, [ALO IND. 4] POT. 0 hole center. Heating at about 300 GRAUS C electrons from M POT 0 or M POT +O POT recombine with holes in [ALO IND. 4] POT. 0, emitting TL light, besides regrouping Al POT. 3+ and M POT. + to reform [Al POT. 3+/M POT. +] system by coulomb attraction. The electrodiffusion experiment was extended to beryl crystal, because beryl has also structural channels. To explain initial sweeping current behaviour as well as thermoluminescent property a mechanism involving [FE POT. 3+/M POT. +] system is proposed.
LOYER, STEPHANE. "Thermoluminescence du quartz naturel : apports methodologiques a la datation des sediments eoliens et contribution a celles des argiles cuites archeologiques." Rennes 1, 1993. http://www.theses.fr/1993REN10077.
Full textMartin, Loïc. "Caractérisation et modélisation d'objets archéologiques en vue de leur datation par des méthodes paléo-dosimétriques : simulation des paramètres dosimétriques sous Geant4." Thesis, Bordeaux 3, 2015. http://www.theses.fr/2015BOR30055/document.
Full textThe paleodosimetric dating methods allow to obtain the age of some mineral materials which behave as natural dosimeters, the age being derived as the ratio of the dose accumulated from the dated event and the natural dose rate to which the sample was subjected.. The determination of the dose rate is usually based on simple models which only allow explicit calculations, but these models reproduce very imperfectly the diversity of situations encountered. Computer modeling allows to represent more complex and more realistic models, which lead to numerically simulate the dose rate. In this work, the toolbox Geant4, allowing to simulate particle-matter interactions by the Monte-Carlo method, was used to create complex models , as well as modeling tools accessible and adaptable to different types of samples and dosimetric situations. Simulations were first made with basic models in order to study the origin of dose rate variations in sediments, highlighting the limits of the simple models commonly used. This information was used to guide the development of modeling tools based on the Geant4 codes, and also to specify the protocols of samples analysis for gathering the data needed for numerical simulations. The DosiVox software allows to easily model a wide variety of samples through a voxelised representation of the object and its environment, and to simulate the radioactivity for calculating the spatial distribution of the dose rate. It was developed with a view of accessibility and current use. Comparisons with dosimetric situations previously studied or measured showed the relevance of the modelings, and the possibilities of this computer tool are exposed through a series of examples and applications. The characterization of the beta dose rate distribution in heterogeneous sediment is one of the most complex problems to be treated. In addition to a study aims at assessing the potential of DosiVox to consider these situations, the DosiSed software was developed specifically for modeling poly-mineral sets of grains. This tool was used to study the heterogeneity of the dose rate in real samples and allowed to include some of the results in a dating problematic
Oliveira, Luiz Carlos de. "Estudos dosimétricos da hidroxiapatita por ressonância paramagnética eletrônica e termoluminescência." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-21052010-104010/.
Full textDosimetric studies on hydroxyapatite (HAp) can be used to determine the absorbed dose in hard tissues in several situation, such as radiologic accidents, control of sterilization process and archaeological dating. This PhD thesis presents studies about radiation dose response assessed by electron paramagnetic resonance (EPR) as well as thermoluminescence in HAp. The fossil mammalian fauna from the Coastal Plain of Rio Grande do Sul State has been known since the late XIX century; however, its biostratigraphic and chronostratigraphic context is still poorly known. The present works describes the results of electron spin resonance (ESR) dating on teeth of extinct mammals collected along the Chuí Creek and coastline. The ages obtained for these samples contribute to a better knowledge about the origin of these fossil. In a second stage of this work, we propose a new EPR spectrum deconvolution (or decomposition) procedure aimed to dosimetry and dating. The method uses the EasySpin (a freeware software) set of functions associated with minimization procedures. After validation, the method was applied in spectrum deconvolution of two Stegomastodon waringi enamel samples, originated from northeast of Brazil. The spectrum econvolution is aimed to verify the superposed components effects on the dosimetric signal over the accumulated dose calculation. The results have shown to be helpful in improving the dose calculation accuracy. In the last stage of this work, synthetic carbonated A-typ hydroxyapatite and natural one were investigated by Thermoluminescence. The obtained results shown that the two samples respond linearly to the ionizing radiation dose. However, the short thermoluminescent glow-peak lifetime suggest that it\'s inadequate for dating purpose.
奥野, 充., Mitsuru Okuno, Ma Hanah T. Mirabueno, 俊夫 中村, Toshio Nakamura, 勲. 高島, Isao Takashima, et al. "フィリピン共和国,ルソン島の火山活動に関する熱ルミネッセンス法と放射性炭素法による年代学的研究(第19回名古屋大学年代測定総合研究センターシンポジウム平成18(2006)年度報告,第2部)." 名古屋大学年代測定資料研究センター, 2007. http://hdl.handle.net/2237/13705.
Full textTudela, Diego Renan Giglioti. "Estudo da luminescência de cristais de quartzo naturais e artificiais crescidos pelo método sol-gel." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-08032019-090623/.
Full textThis work was divided into two major parts, the first one related to the study of the luminescence of four Brazilian natural quartz specimens (green, hyaline, pink and blue) and the second one deals with the confection and characterization of synthetic samples, based on SiO2 structure, obtained by means of sol-gel method to environmental ionizing radiation dosimetry. Through Instrumental Neutron Activation Analysis (INAA) and Total Reflection X-ray Fluorescence (TXRF), the main impurities in major, minor and trace concentrations were determined quantitative and qualitatively respectively. The green and blue specimens presented the highest amounts of impurities, including metals and rare earth elements, whereas hyaline and pink are practically pure. Their TL emissions were distinct, in terms of intensity and peak position. OSL dose recovery tests, using multiple (MAR) and single aliquots regeneration (SAR) dose protocols were performed and the green specimen was the only one which presented satisfactory results in these tests, followed by blue. The hyaline and pink crystals showed saturation and growth curve out of linearity, where the first one showed the effect of phototransference for most SAR analysis. As green and hyaline crystals presented opposite results, in terms of impurities quantities and luminescent emissions, a high temperature (1600 °C) heat treatment was performed to observe the effect of the phase change (cristobalite) on its luminescent emissions. Theoretical adjustments of the CW-OSL, LM-OSL and TL emission curves showed that they follow the theoretical model of general order kinetics. In the second part of this work, 32 artificial samples of the high temperature polymorph of the quartz, cristobalite, were synthesized with different amounts and types of dopants, based on impurities determined in green quartz, making use of two heating rates in the calcinations (3 and 15 °C/min). This part of the work had as purpose the study of the effect of Fe in the luminescent emission of the synthetic samples, the reproduction of one of the natural samples and production and characterization of dosimeters for environmental ionizing radiation. The use of the two heating rates in TL emission, in general, did not play a determining role in the intensity of the high temperature peaks. In the OSL, it was observed that samples calcined with higher heating rate temperature showed higher response to dose. The Fe as a dopant in greater quantities acted as a quencher of luminescence both in TL and OSL. A sample with qualitative characteristics similar to the green quartz, in the cristobalite phase, was obtained with relative success using as dopants all the twelve main impurities acquired for this project. Four samples were synthesized with different types and amounts of dopants for application in ionizing radiation dosimetry. Only one of these showed a linear response to radiation doses using thermal stimulation (TL), with a minimum detectable dose (MDD) of 172 µGy. Using optical stimulation (OSL), two samples showed linear behavior with radiation doses, in which MDD values of ~440 µGy and 405 µGy were obtained.
Bassinet, C. "Datation par luminescence : recherches méthodologiques et applications au volcanisme dans l'environnement de Laschamp." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2007. http://tel.archives-ouvertes.fr/tel-00171318.
Full textSANTOS, JOSE O. dos. "Estudos arqueométricos de sitios arqueológicos do baixo São Francisco." reponame:Repositório Institucional do IPEN, 2007. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11536.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Hickel, Pierre-Emmanuel. "Croissance hydrothermale du quartz-A : solubilité, caractérisations physico-chimiques et applications des monocristaux." Bordeaux 1, 2000. http://www.theses.fr/2000BOR10517.
Full textQuartz-a is a piezoelectric component of high frequency electronic devices. Improving its performance requires a reduction in the physical and chemical defects induced during the hydrothermal growth of the crystals. With this objective in mind this study has concentrated on two main areas of research; the search of new solvents in which the solubility of quartz is suitable for the hydrothermal growth process and the ability to grow crystals with thermodynamic parameters that are more demanding than those currently in use in industrial processes. These two areas of research have required further development of the existing technology so as to improve the reliability of the production processes. In particular by improving the seal for the autoclave and adopting an accurate real time control system. In the long term this research will help bring about better knowledge of ways to analyse the defects in the growth of synthetic crystals. As a first step towards thi crystal defects have been purposely introduced and the signal obtained interpreted using a number of investigative techniques. Infra-red spectrometry, ICPMS, Castaing microprobe, cathodoluminescence, thermoluminescence, X-ray topography)
Bassinet, Céline. "Datation par luminescence : recherches méthodologiques et applications au volcanisme dans l'environnement de Laschamp." Clermont-Ferrand 2, 2007. https://tel.archives-ouvertes.fr/tel-00171318.
Full textSantos, José Osman dos. "Estudos arqueométricos de sítios arqueológicos do baixo São Francisco." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-18052012-134947/.
Full textThe study of the physical and chemical characteristics of the ceramics crafts, in association with historical and archaeological research, has allowed for the reconstruction of the cultural habits from ancient communities. The goal of this work was to study the chemical and mineralogical compositions of archaeological potteries collected from Justino, São José, Curituba, Saco da Onça, Porto Belo and Vitória Régia sites, located in Baixo São Francisco region, Sergipe state, Brazil. The use of the instrumental neutron activation analysis (INAA) and X-ray diffractometry (XRD), allowed the definition of compositional groups of potteries according to the chemical similarities of the ceramic paste, which reveals the composition of the raw materials utilized in the manufacturing process by prehistoric man, and the inference of the atmosphere and temperatures in which the potteries were burned. The outliers were identified by means of classic and robust Mahalanobis distance. The temper effect in the ceramic paste was studied by means of modified Mahalanobis filter. The results were interpreted by means of cluster analysis, principal components analysis and discriminant analysis. The ages of some potteries were determined by means of the thermoluminescence techniques. The results obtained in this work, in association with archaeological information, allowed for the identification of the ceramic groups relative to ceramist occupations at Justino Site and for the definition of the reference groups according to the chemical composition. The burning technology was established for some potteries and the relative ages among the compositional groups were determined by means of TL. Thus, this work provides contributions to the reconstmction of the prehistory of the communities which lived in the Baixo São Francisco region, and to the reconstitution of the general frame of the ceramist population from Brazilian Northeast.
Júnior, Valdomiro Severino de Souza. "Mineralogia de solos e ambientes de sedimentação em manguezais do Estado de São Paulo." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-05042006-142238/.
Full textMangroves are formed by groups of trees and shrubs that develop in the intertidal zone of tropical regions. This ecosystem to establish in the interface of both marine and continental environment, present its formation related to the sea-level fluctuations during the quaternary period, where the terrigenous and marine sediments are deposited in rivers valleys, edges of lagoons and bays. The knowledge of both particle distribution and minerals constituent of soils in estuarines areas, can aid to understand the processes of sedimentation and geochemistry in this site. This study was carried out with mangroves distributed along the São Paulo State coast, and aims to characterize the sedimentary environments in accordance with grain size and process of quaternary evolution, to determine qualitatively and semiquantitatively the mineralogical assemblage and to identify the smectites types in these soils. Samples were collected from 14 mangroves soils at the layers 0-20 and 60-80cm, and also was collected sediment in suspension of the Ribeira de Iguape River, and samples of different depths for dating. The clay, silt and total sand sizes and 5 sand fractions were determined, radiocarbon dating were carried out by liquid scintillation counting and accelerator mass spectrometry in humin fraction of the soil organic matter and by thermoluminescence of quartz grains. The mineralogical analyses were carried out by XRD, FTIR, TEM, SEM, DTA and GTA in silt and clay sizes and in the sediment in suspension, also was made the Greene-Kelly test to identify the smectites type. According to the results we concluded that the mangroves soils from São Paulo State have different textures varying from sandy up to very clay, also occuring high silt contents. All the mangroves are holocenic, with ages varying from 410 yr B.P. to 3,700 yr; the particle distribution is related to the current geomorphological setting of the estuary and the origin of coastal sediments. The mineralogical assemblage is constituted of pyrite, nontronite, kaolinite, illite, biotite, gibbsite, quartz, feldspars, and locally occurs goethite, vermiculite, halloysite and anatase; the aloctones minerals are from both the terrigenous and marine origin; the difference between geomorphological settings along the coastal plain rules mineral distribution, and still it was inferred the neoformation of esmectita and kaolinite and that the process of organic matter mineralization in these soils may be using Fe3+ from nontronite as an electron acceptor.
Heydari, Maryam. "Applying Bayesian models to improve luminescence-based chronologies of Middle to Upper Palaeolithic sites in Iran." Thesis, Bordeaux 3, 2020. http://www.theses.fr/2020BOR30014.
Full textStatistical data analysis is a fundamental aspect of luminescence dating. For decades, data processing predominantly employed the frequentist (classic) school of thinking. Only recently, development of Bayesian modelling specifically for luminescence dating in R environment has provided an alternative. This thesis aims firstly to discuss the benefits of applying Bayesian models over the frequentist approach, and secondly to provide the first luminescence-based chronologies for Middle-Upper Palaeolithic key sites in Iran. Due to its location at the intersection between Africa, Europe and Central Asia, the Iranian plateau is of importance in tracking human dispersal over time. Despite this, there are very few chronologies spanning the Palaeolithic period in Iran. This thesis focuses on three key sites: Mirak, located at the margin of the central Iranian desert, the site of Gh¯ar-e Boof in the southern Zagros Mountains, and Bawa Yawan in the central Zagros Mountains. Bayesian modelling of chronologies produced for the site of Mirak, date Upper, Intermediate and Middle Palaeolithic assemblages 21–28 ka, 26–33 ka and 43–55 ka (95% CI) respectively. For the site of Gh¯ar-e Boof, we dated the Upper Palaeolithic culture to 37–42 ka (95% CI) and the Middle Palaeolithic culture to 44–84 ka (95% CI). For the site of Bawa Yawan, ages spanning 56–90 ka (95% CI) were obtained for assemblages attributed to the Middle Palaeolithic. The chronological study also unravelled an age range of 12–16 ka for a unit attributed to the Epipalaeolithic culture. Based on the study of these sites, this thesis discusses the essential aspect for applying Bayesian methods in luminescence dating. In particular, we note the benefits of Bayesian models to address systematic shared errors between samples and the ability to include independent chronological information, such as stratigraphic constraints or radiocarbon ages. This has helped to improve the precision of the Palaeolithic chronologies for Iran. Furthermore, this thesis tests the ability of Bayesian models to obtain an accurate central dose for well-bleached samples compared to one frequentist model, when quartz signals are close to saturation or when beta-dose rate heterogeneity in the surrounding sediment is high
Almond, Peter C. "Soils and geomorphology of a lowland rimu forest managed for sustainable timber production." Lincoln University, 1997. http://hdl.handle.net/10182/1782.
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