Thematische Bibliographien / Thermoluminescence dosimetry

Auswahl der wissenschaftlichen Literatur zum Thema „Thermoluminescence dosimetry“

Autor: Grafiati
Veröffentlicht am 4. Juni 2021
Zuletzt aktualisiert am 4. Februar 2022

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  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Zeitschriftenartikel zum Thema "Thermoluminescence dosimetry":

1

Bhatt, B. C., und M. S. Kulkarni. „Thermoluminescent Phosphors for Radiation Dosimetry“. Defect and Diffusion Forum 347 (Dezember 2013): 179–227. http://dx.doi.org/10.4028/www.scientific.net/ddf.347.179.

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The use of thermoluminescence (TL) as a method for radiation dosimetry of ionizing radiation has been established for many decades and has found many useful applications in various fields, such as personnel and environmental monitoring, retrospective dosimetry, medical dosimetry, space dosimetry, high-dose dosimetry. Method of preparation, studies and applications of thermoluminescence (TL) dosimetric materials are reviewed. Several high sensitivity thermoluminescent dosimeters (TLDs) are now commercially available in different physical forms. These commercial TL dosimeters comply with a set of stringent requirements stipulated by the International Electrotechnical Commission (IEC). Specific features of TL phosphors for thermal neutron, fast neutron and high-energy charged particle (HCP) dosimetry are also considered. Some of the recent developments in the field of optically stimulated luminescence (OSL) and radiophotoluminescence (RPL) are also summarized. Comparative advantages of TL, OSL and RPL dosimeters are given. Results of recent studies of TL in nanosized materials are briefly presented. Future challenges in this field will also be discussed. Contents of Paper
2

Gasiorowski, Andrzej, Piotr Szajerski und Jose Francisco Benavente Cuevas. „Use of Terbium Doped Phosphate Glasses for High Dose Radiation Dosimetry—Thermoluminescence Characteristics, Dose Response and Optimization of Readout Method“. Applied Sciences 11, Nr. 16 (05.08.2021): 7221. http://dx.doi.org/10.3390/app11167221.

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The phosphate glass samples doped with Tb2O3 oxide (general formula: P2O5-Al2O3-Na2O-Tb2O3) were synthesized and studied for usage in high-dose radiation dosimetry (for example, in high-activity nuclear waste disposals). The influence of terbium concentration on thermoluminescent (TL) signals was analyzed. TL properties of glasses were investigated using various experimental techniques such as direct measurements of TL response vs. radiation dose, Tmax–Tstop and VHR (various heating rate) methods, and glow curve deconvolution analysis. The thermoluminescence dosimetry (TLD) technique was used as the main investigation tool to study detectors’ dose responses. It has been proved that increasing the concentration of terbium oxide in glass matrices significantly increases the thermoluminescence yield of examined material. For the highest dose range (up to 35 kGy), the dependence of the integrated thermoluminescent signals vs. dose can be considered as a saturation-type curve. Additional preheating of samples improves linearity of signal vs. dose dependencies and leads to a decrease of the signal loss over time. All obtained data suggest that investigated material can be used in high-dose radiation dosimetry. Additional advantages of the investigated dosimetric system are its potential ability to re-use the same dosimeters multiple times and the fact that reading dosimeters only requires usage of a basic TL reader without any modifications.
3

Wang, Xiao Ning, Jing Ning, Xiao Wei Fan, Chen Zhang, Xiao Sheng Huang und Ying Huang. „Development of the Thermoluminescence Dosimetry Measure and Control System“. Advanced Materials Research 663 (Februar 2013): 1023–28. http://dx.doi.org/10.4028/www.scientific.net/amr.663.1023.

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Briefly introduces the detection principle, characteristic and method of thermoluminescence dosimetry, and designs a set of data acquisition and processing system for thermoluminescence dosimeter reader. The device’s peripheral hardware circuit design is simple and scalable. This system can be applied to a variety of thermoluminescence dosimetry testing equipment.
4

Oliveira Junot, Danilo, Marcos A. P. Chagas und Divanízia Do Nascimento Souza. „ANÁLISE TERMOLUMINESCENTE DE COMPÓSITOS DE CaSO4 ATIVADO COM TERRAS RARAS“. Eclética Química Journal 38, Nr. 1 (25.10.2017): 90. http://dx.doi.org/10.26850/1678-4618eqj.v38.1.2013.p90-94.

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Since the thermoluminescence started to be applied to the dosimetry of ionizing radiation in 1940 different materials detectors have been proposed, and one of the most common is CaSO4. The motivation of this work was to produce crystals of CaSO4 doped with rare earth elements such as europium (Eu), neodymium (Nd) and thulium (Tm). It was also produced crystals of CaSO4:Ag. The interest in the production of these materials was to investigate other methods of production of thermoluminescent materials. The results show that the CaSO4:Tm is more suitable for use in the thermoluminescent dosimetry. Although not the most intense peak, the peak at 170 °C could be a dosimetric peak. Analyses showed that all samples have a TL response proportional to the dose absorbed.
5

Omanwar, S. K., K. A. Koparkar und Hardev Singh Virk. „Recent Advances and Opportunities in TLD Materials: A Review“. Defect and Diffusion Forum 347 (Dezember 2013): 75–110. http://dx.doi.org/10.4028/www.scientific.net/ddf.347.75.

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Thermoluminescence (TL) is the thermally stimulated emission of light from an insulator or a semiconductor following the previous absorption of energy from ionizing radiation. TL dosimetry is used in many scientific and applied fields such as radiation protection, radiotherapy, industry, and environmental and space research, using many different materials. The basic demands of a thermoluminescent dosimeter (TLD) are good reproducibility, low hygroscopicity, and high sensitivity for very low dose measurements and good response at high doses in radiotherapy and in mixed radiation fields. In this review, we have discussed the past developments and the future opportunities in TLD materials and our efforts to make better future use of low cost materials in TLD applications. For this we have studied and discussed two efficient TLD phosphors with low cost and simple method of preparation on large scale for TLD materials. One of the phosphors is LiF:Mg,Cu,P (LiF: MCP), and another one is LiCaAlF6:Eu, which has the potential to replace conventionally used CaSO4:Dy TL dosimeter. LiF: MCP and LiCaAlF6: Eu phosphors are potential candidates for TL dosimetry and could be good replacement for commercially available phosphors. Apart from this, we have also studied thermoluminescence in Aluminate and Borate materials. We have discussed in detail all three types of TLD materials. First, our study includes complete detail of material properties, methods and dosimetric characterizations of LiF: MCP Phosphor; second, it includes a new TL Dosimeter, LiCaAlF6: Eu and its dosimetric characterizations; and lastly on some TL properties of Li5AlO4: Mn and MgB4O7: Dy,Na. In this review, we discus some recent developments in radiation dosimetry with regards to the measurement techniques and material preparations. Although many materials have been and are currently being studied for TLD, still there is a scope for the improvement in the material properties useful for the TLD, and the synthesis of new, more suitable materials. Contents of Paper
6

Murthy, K. V. R. „Thermoluminescence and its Applications: A Review“. Defect and Diffusion Forum 347 (Dezember 2013): 35–73. http://dx.doi.org/10.4028/www.scientific.net/ddf.347.35.

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The present review article contains various applications of Thermoluminescence. The phenomena of thermoluminescence (TL) or thermally stimulated luminescence (TSL) and optically stimulated luminescence (OSL) are widely used for measurement of radiation doses from ionizing radiations, viz. x-rays, γ rays and β particles. The applications of TL are initiated in the field of Geology followed by Archaeology, personal dosimetry, material characterization and many more to name. The TL technique has been found to be useful in dating specimens of geologically recent origin where all other conventional methods fail. It has been found to be highly successful in dating ancient pottery samples. The TL/OSL dating is done from a quartz grain, which is collected from pottery or brick, by reading the TL-output. The main basis in the Thermoluminescence Dosimetry (TLD) is that TL output is directly proportional to the radiation dose received by the phosphor and hence provides the means of estimating the dose from unknown irradiations. The TL dosimeters are being used in personnel, environmental and medical dosimetry. During the last two decades, OSL based dosimeters have also been used for various applications. Natural and induced TL signals can be used to explore mineral, oil and natural gas. The present review presents TL theory, TL of minerals, salt, cement, salt crystals from pickles, and low temperature thermoluminescence (LLTL) of few agricultural products. Contents of Paper
7

Amer, Hany, Mostafa Elashmawy, Huda Alazab und El-Din Ezz. „Suitability of pure nano crystalline LiF as a TLD dosimeter for high dose gamma radiation“. Nuclear Technology and Radiation Protection 33, Nr. 1 (2018): 93–99. http://dx.doi.org/10.2298/ntrp1801093a.

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LiF is an alkali halide that is commonly used in radiation dosimetry utilizing its well-known thermoluminescence property. Pure LiF has very limited use in radiation dosimetry since the density and types of the internal traps are limited. For that reason, LiF is usually doped with different elements such as Mg and Ti in (TLD-100) to enhance its thermoluminescence properties and to be suitable for dosimetry applications. In this work we used ball milling as an alternative to dopants (impurities) to induce structure defects (e.g. dislocation) that will play the major role in thermoluminescence process similar to defectsecaused by dopants. The dislocation density of 1 h ball milled pristine LiF was evaluated at the MCX beamline of the Italian Synchrotron ELETTRA. A ball milled LiF was then compressed in the form of chips, then annealed for 1 h at 600?C to get rid of low temperature dislocations. The annealed samples showed linear response in the range 50-300 Gy. Fading investigation showed that the integral thermoluminescence intensity almost stabilizes after 12 days from the first irradiation. Results indicate that ball milling is a new promising technique to produce thermoluminescence dosimeters without using any kind of dopants.
8

Hamilton, Ian. „OPERATIONAL THERMOLUMINESCENCE DOSIMETRY“. Health Physics 78, Nr. 5 (Mai 2000): 569. http://dx.doi.org/10.1097/00004032-200005000-00020.

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9

Abraheem, Abeer Z., F. Khamis und Y. A. Abdulla. „TL Characteristics and Dosimetric Aspects of Mg-Doped ZnO“. European Journal of Applied Physics 3, Nr. 1 (29.01.2021): 43–47. http://dx.doi.org/10.24018/ejphysics.2021.3.1.37.

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Dosimetry characterization and the evaluation of kinetics parameters of trapping states of Mg-doped ZnO phosphors synthesized by Sol-Gel technique. The thermoluminescence response of Mg-doped ZnO samples showed a linear response when exposed to X-ray radiation and the optimum annealing condition was 400oC/4h for the three concentrations. A broad-shaped TL glow curve with an upper bound of 270 °C, which shifts to lower temperatures with increasing dose, indicating that general order (GO) kinetics thermoluminescence processes are involved. We conclude that the ZnO doped Mg phosphors under study are promises to develop dosimeters for high radiation dose measurements. Kinetic parameters, such as activation energy (E), frequency factor (s), and order of kinematic order (b), were estimated by the Glow Curve Deconvolution (GCD) method. ZnO:Mg phosphor has a great potential as a dosimeter for monitoring in the fields of ionizing radiation.
10

Paprocki, K., J. Winiecki, R. Kabacińska, K. Przegietka, M. Szybowicz und K. Fabisiak. „Thermoluminescence properties of undoped diamond films deposited using HF CVD technique“. Materials Science-Poland 35, Nr. 4 (21.03.2018): 785–90. http://dx.doi.org/10.1515/msp-2017-0103.

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Abstract Natural diamond has been considered as a perspective material for clinical radiation dosimetry due to its tissuebiocompatibility and chemical inertness. However, the use of natural diamond in radiation dosimetry has been halted by the high market price. The recent progress in the development of CVD techniques for diamond synthesis, offering the capability of growing high quality diamond layers, has renewed the interest in using this material in radiation dosimeters having small geometricalsizes. Polycrystalline CVD diamond films have been proposed as detectors and dosimeters of β and α radiation with prospective applications in high-energy photon dosimetry. In this work, we present a study on the TL properties of undoped diamond film samples grown by the hot filament CVD (HF CVD) method and exposed to β and α radiation. The glow curves for both types of radiation show similar character and can be decomposed into three components. The dominant TL peaks are centered at around 610 K and exhibit activation energy of the order of 0.90 eV.
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Zeitschriftenartikel Dissertationen Bücher

Dissertationen zum Thema "Thermoluminescence dosimetry":

1

Samei, Ehsan. „Theoretical study of various thermoluminescent dosimeters heating schemes“. Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/16481.

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2

Issa, Fatma Mabruk. „Doped optical fibres thermoluminescence dosimetry for brachytherapy“. Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580336.

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In the various brachytherapy techniques the intent is to deliver as high a tumour dose as possible, limited only by surrounding normal tissue tolerance. The main feature of the techniques is very steep dose gradients, representing a potential limiting factor in accurate dose distribution measurements around sources. Dose distributions at distances less than 1 cm are therefore normally generated using either validated Monte Carlo (MC) simulations or standard dose calculation formalisms, for example that of AAPM TG 43, while dose measurements can only be performed at larger distances, normally greater than 1 cm from the outer dimensions of the source encapsulation Ge-doped silica fibres are a viable thermoluminescent dosimetry (TLD) system, providing good spatial resolution of approximately 120 urn, sensitive response to ionizing radiations, large dynamic dose range, good reproducibility and reusability, dose rate independence, minimal fading, resistance to water and low cost. Dosimetric characterisation of commercial Ge-doped silica fibres have been obtained by subjecting them to kilovoltage therapeutic x-ray radiation beams, verifying their use for brachytherapy sources; dose response, reproducibility and fading at 90 kVp and 300 kVp have been investigated. Central-axis depth doses have been obtained at the two accelerating potentials using different field size applicators, measurements being made using the fibres in both water and a GAMMEX RMr 4571 solid water phantom. Comparison has been made with central-axis depth doses, measured using a 0.6 cm3 graphite-walled ionisation chamber data and British Journal of Radiology Supplement 25 tabulated values (both in water). Ge-doped optical fibre dosimeters show good dosimetric response for low photon energies. These desirable characteristics support the use of these TL fibres as dosimeters for brachytherapy applications. Ge-doped optical fibre TL dosimeters have been used to measure the dose distribution around two Low Dose Rate (LDR) 125r seeds; model 6711, the new thinner model 9011 and a High Dose Rate (HDR) 192rr (MicroSelectron V2) source at proximal distances down to 1 mm, measured in a Perspex medium. The anisotropy has also been measured in Perspex, for distances from 10 to 100 mm from a LDR 1251 seed model 6711 centre, in 10 mm increments and at angles 10° to 90° in 10° increments from the seed central axis. Measured doses have been compared with calculations and treatment planning system (TPS) predicted doses for the same locations. Monte Carlo simulations were obtained using the EGSnrc \ DOSRZnrc codes and TPS predicted doses were obtained using the system VariSeed V8.0.2. For 1251 seed model 6711, the measurements agree with simulations to within 2.3 % ± 0.3 % along the transverse and perpendicular axes and within 3.0 % ± 0.5 % for measurements investigating anisotropy in angular dose distribution. Measured and Veriseed™ brachytherapy treatment planning system (TPS) values agreed to within 2.7 % ± 0.5 %. For the new thinner 1251 model 9011, dose measurements were in good agreement with simulations to within 2.1 ± 0.2 %, while dose measurements and doses obtained through use of the Variseed TPS agreed well, to within 2.2 ± 0.5 %. The above work has therefore demonstrated the applicability of Ge-doped optical fibres for use in brachytherapy.
3

Lontsi, Sob Aaron Joel. „Thermoluminescence of natural quartz“. Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013358.

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The kinetic and dosimetric features of the main thermoluminescence peak of quartz have been investigated in unannealed as well in quartz annealed at 500˚C for 10 minutes. The main peak is found at 92 and 86˚C respectively for aliquots of unannealed and annealed samples irradiated to 10 Gy and heated at 5.0˚C/s. For each sample, the intensity of the main peak is enhanced with repetitive measurement whereas its maximum temperature is unaffected. The peak position of the main peak in each sample is independent of the irradiation dose and this, together with its fading characteristics are consistent with first-order kinetics. For low doses, typically between 2 and 10 Gy, the dose response of the main peak in each sample is linear. In the intermediate dose range from 10 to 60 Gy, the growth of the main peak in each sample is sub-linear and for greater doses, in the range from 60 Gy to 151 Gy, it is linear again. The half-life of the main peak of the unannealed sample is about 1.3 h whereas that of the annealed sample is about 1.2 h. The main peak in each sample can be approximated to a first-order glow peak. As the heating rate increases, the intensity of the main peak in each sample decreases. This is evidence of thermal quenching. The main peak in each sample is the only peak regenerated by phototransfer. The resulting phototransferred peak occurs at the same temperature as the original peak and has similar kinetic and dosimetric features. For a preheat temperature of 120˚C, the intensity of the phototransferred peak in each sample increases with illumination time up to a maximum and decreases afterwards. At longer illumination times (such as 30 min up to 1 h), no further decrease in the intensity of the phototransferred peak is observed. The traps associated with the 325˚C peak are the main source of the electrons responsible for the regenerated peak. Radioluminescence emission spectra were also measured for quartz annealed at various temperatures. Emission bands in quartz are affected by annealing and irradiation. A strong enhancement of the 3.4 eV (~366 nm) emission band is observed in quartz annealed at 500˚C. A new emission band which grows with annealing up to 1000˚C is observed at 3.7 eV (~330 nm) for quartz annealed at 600˚C. An attempt has been made to correlate the changes in radioluminescence emission spectra due to annealing with the influence of annealing on luminescence lifetimes in quartz.
4

CAMPOS, VICENTE de P. de. „Desenvolvimento e avaliação de um novo porta detector/filtro para monitoramento termoluminescente com CaSOsub(4):Dy/PTFE“. reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11370.

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Made available in DSpace on 2014-10-09T12:51:12Z (GMT). No. of bitstreams: 0
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Dissertacao (Mestrado)
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Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
5

Batista, Bernardo José Braga. „Avaliação de dosímetros termoluminescentes para uso em radioterapia com fótons de alta energia“. Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26042012-152350/.

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Atualmente a maior parte dos tratamentos radioterápicos é feita através de irradiações com feixes de fótons de alta energia. Esses feixes se originam em fontes radioativas (de nuclídeos como o cobalto 60) ou são gerados em aceleradores lineares de elétrons. Para as medidas dosimétricas nesses feixes, uma das técnicas mais utilizada é a termoluminescência (TL) e, para a correta utilização dos dosímetros termoluminescentes (TLDs), é necessário conhecer suas características dosimétricas como, por exemplo, a variação da sua resposta com a energia do feixe de radiação. O objetivo desse trabalho foi estudar essa dependência energética da resposta TL de diversos materiais quando irradiados em feixes de fótons de alta energia. Para isso, foram obtidas curvas de resposta TL em função da dose absorvida em água para os LDs de LiF:Mg, Ti (TLD-100), fluorita natural brasileira, CaSO4:Dy, Mg2SiO4:Tb e l2O3:C irradiados em feixes gama de 60Co e de raios X de aceleradores lineares com potenciais de aceleração nominais de 6, 10, 15 e 18 MV. O estudo foi feito em uma faixa de doses equivalente à utilizada em fracionamentos padrão de tratamentos de radioterapia e os resultados demonstram que, nessas condições, não há variação maior que 3% na resposta TL em função da energia dos fótons. A relação entre a deposição e doses nos TLDs e a deposição de doses na água em função da variação da energia oi estudada por simulação de Monte Carlo (MC), através do código PENELOPE, e os resultados foram coerentes com os resultados experimentais. Os TLDs também foram irradiados com nêutrons térmicos e epitérmicos e apresentaram sensibilidade a esse tipo de radiação. No entanto, a coerência dos resultados experimentais e de MC (que não levaram em conta a presença de nêutrons), o estudo da variação da sensibilidade relativa com a energia e a análise das curvas de emissão dos TLDs levam à conclusão e que a influência na resposta TL devida a nêutrons que contaminam os feixes de fótons estudados, é desprezível para todos os materiais. Os resultados desse trabalho indicam que, para a faixa de doses e energias utilizadas rotineiramente na radioterapia, os TLDs de LiF:Mg, Ti (TLD-100), fluorita natural brasileira, CaSO4:Dy, Mg2SiO4:Tb e Al2O3:C podem ser utilizados sem a aplicação de fatores de correção para a energia do feixe.
Currently the majority of radiotherapy treatments are done by irradiation with high energy photon beams. These beams are emitted by radioactive sources (of nuclides such as cobalt 60) or generated in electron linear accelerators. For dosimetric measurements on these beams, one of the most used techniques is the thermoluminescence (TL). For the correct use of the thermoluminescent dosimeters (TLDs), it is necessary to know their dosimetric properties like, for example, the variation of their response with the energy of the radiation beam. The purpose of this study was to assess the energy response of various TL materials when irradiated with high energy photon beams. So, curves relating the TL response and absorbed dose to water were obtained for LiF:Mg, Ti (TLD-100), Brazilian natural fluorite, CaSO4:Dy, g2SiO4:Tb and Al2O3:C TLDs irradiated with gamma rays from a 60Co source and linear accelerator X ray beams with nominal accelerating potential of 6, 10, 15 and 18 MV. The study was done in a dose range similar to that used in standard fractionated radiotherapy treatments and the results show that under these conditions, there is no variation larger than 3% in the TL response as a function of photon energy. The relationship between the dose deposition in the TLD and the dose deposition in water in function of the photon energy was studied by Monte Carlo method (MC), using the PENELOPE code system, and the results were consistent with the experimental outcomes. The TLDs were also irradiated with thermal and epithermal neutrons and proved to be sensitive to them. However, the consistency of the experimental and MC results (which did not take into account the presence of neutrons), the study of the variation in TL relative sensitivity with the beam energy, and the TLD glow curve shape analysis lead to the conclusion that the influence on TL response due to neutron contamination in the therapeutic photon beams is negligible for all materials. The results indicate that for the range of doses and energies used routinely in radiotherapy, the LiF:Mg, Ti (TLD-100), Brazilian natural fluorite, CaSO4:Dy, Mg2SiO4:Tb and Al2O3:C TLDs can be used without applying any correction factors for the beam energy.
6

Seneza, Cleophace. „Thermoluminescence of secondary glow peaks in carbon-doped aluminium oxide“. Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013053.

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Carbon-doped aluminium oxide, α-Al₂O₃ : C, is a highly sensitive luminescence dosimeter. The high sensitivity of α-Al₂O₃ : C has been attributed to large concentrations of oxygen vacancies, F and F⁺ centres, induced in the material during its preparation. The material is prepared in a highly reducing atmosphere in the presence of carbon. In the luminescence process, electrons are trapped in F-centre defects as a result of irradiation of the material. Thermal or optical release of trapped electrons leads to emission of light, thermoluminescence (TL) or optically stimulated light (OSL) respectively. The thermoluminescence technique is used to study point defects involved in luminescence of α-Al₂O₃ : C. A glow curve of α-Al₂O₃ : C, generally, shows three peaks; the main dosimetric peak of high intensity (peak II) and two other peaks of lower intensity called secondary glow peaks (peaks I and III). The overall aim of our work was to study the TL mechanisms responsible for secondary glow peaks in α-Al₂O₃ : C. The dynamics of charge movement between centres during the TL process was studied. The phototransferred thermoluminescence (PTTL) from secondary glow peaks was also studied. The kinetic analysis of TL from secondary peaks has shown that the activation energy of peak I is 0.7 eV and that of peak III, 1.2 eV. The frequency factor, the frequency at which an electron attempts to escape a trap, was found near the range of the Debye vibration frequency. Values of the activation energy are consistent within a variety of methods used. The two peaks follow first order kinetics as confirmed by the TM-Tstop method. A linear dependence of TL from peak I on dose is observed at various doses from 0.5 to 2.5 Gy. The peak position for peak I was also independent on dose, further confirmation that peak I is of first order kinetics. Peak I suffers from thermal fading with storage with a half-life of about 120 s. The dependence of TL intensity for peak I increased as a function of heating rate from 0.2 to 6ºCs⁻¹. In contrast to the TL intensity for peak I, the intensity of TL for peak III decreases with an increase of heating rate from 0.2 to 6ºCs⁻¹. This is evidence of thermal quenching for peak III. Parameters W = 1.48 ± 0:10 eV and C = 4 x 10¹³ of thermal quenching were calculated from peak III intensities at different heating rates. Thermal cleaning of peak III and the glow curve deconvolution methods confirmed that the main peak is actually overlapped by a small peak (labeled peak IIA). The kinetic analysis of peak IIA showed that it is of first order kinetics and that its activation energy is 1:0 eV. In addition, the peak IIA is affected by thermal quenching. Another secondary peak appears at 422ºC (peak IV). However, the kinetic analysis of TL from peak IV was not studied because its intensity is not well defined. A heating rate of 0.4ºCs⁻¹ was used after a dose of 3 Gy in kinetic analysis of peaks IIA and III. The study of the PTTL showed that peaks I and II were regenerated under PTTL but peak III was not. Various effects of the PTTL for peaks I and II for different preheating temperatures in different samples were observed. The effect of annealing at 900ºC for 15 minutes between measurements following each illumination time was studied. The effect of dose on secondary peaks was also studied in this work. The kinetic analysis of the PTTL intensity for peak I showed that its activation energy is 0.7 eV, consistent with the activation energy of the normal TL for peak I. The PTTL intensity from peak I fades rapidly with storage compared with the thermal fading from peak I of the normal TL. The PTTL intensity for peak I decreases as a function of heating rate. This decrease was attributed to thermal quenching. Thermal quenching was not observed in the case of the normal TL intensity. The cause of this contrast requires further study.
7

Woodman, Robert Harvey. „Development of magnesium tetraborate as a material for thermoluminescence dosimetry“. Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/50096.

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Magnesium tetraborate is a candidate phosphor for a laser-heated thermoluminescence (TL) dosimetry system which is under development. Near tissue-equivalent radiation absorption properties and reported sensitivity to low radiation doses offer advantages over commonly employed LiF phosphors. Sintered wafers suitable for routine measurement were prepared. The effects of powder preparation conditions and activator concentration on TL sensitivity were investigated. Samples with additional impurities (co-doped samples) were prepared in order to increase sensitivity through coactivation or sensitization effects. TL emission spectra were employed to evaluate the effects of co-doping.
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8

França, Leonardo Vinícius da Silva. „Development of a Thermoluminescence - Radioluminescence Spectrometer“. Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-29052018-162229/.

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In this work, initially the radioluminescence (RL) and thermoluminescence (TL) techniques are presented. The radioluminescence is the prompt luminescence emitted by a material under ionizing radiation exposure. The thermoluminescence is the luminescence emitted by a material previously exposed to ionizing radiation when excited by heat. Enegy bands concepts, defects in crystals and the different processes of ionization that take place in matter when exposed to ionizing radiation are briefly discussed in order to present the mechanisms involved in RL and TL processes. The usage of the techniques in characterization of materials and dosimetry is reported, legitimating the importance of the instrument developed. Mechanical and structural parts as well as a description of each component of the instrument are fairly described. The implemented algorithm for controlling the instrument and acquiring data is also discussed. The development of the instrument enabled us to generate temperature ramps with a quite good performance, reaching temperatures up to 500 °C with deviations up to 2 °C, having used heating rates between 0.5 °C/s and 5 °C/s. Calibrations of optical spectrometer used in light collection and irradiation system were carried out. Lastly, TL and RL spectra tests were performed. The RL tests were carried out using several materials which emission spectra are well known by literature, namely, carbon-doped aluminium oxide Al2O3:C, terbium-doped gadolinium oxysulphide Gd2O2S:Tb, europium-doped yttrium oxide Y2O3:Eu and dysprosium-doped calcium borate CaB6O10:Dy. For the TL spectra test, the aluminium oxide doped with carbon Al2O3:C was used. The results of RL and TL spectra tests showed a good agreement with the literature, pointing out that the instrument developed in this work is comparable to others instruments in operation from others research groups, making our results reliable.
Nesse trabalho, inicialmente as técnicas de radioluminescência (RL) e termolumi- nescência (TL) são apresentadas. A radioluminescência é a luminescência imediata emitida por um material quando exposto à radiaçao ionizante. A termoluminescência é a luminescência emitida por um material previamente exposto à radiação quando este é aquecido. Conceitos de bandas de energia, defeitos em cristais e os diferentes processos de ionização que ocorrem na matéria quando exposta à radiação ionizante são brevemente discutidos a fim de apresentar os mecanismos envolvidos na RL e TL. A utilização das técnicas na caracterização de materiais e na dosimetria é reportada, justificando a importância do instrumento desenvolvido. As partes mecânicas/estruturais e uma descrição de cada componente do instrumento são descritos. O algoritmo implementado para controle do instrumento e aquisição de dados é também descrito. O desenvolvimento do instrumento possibilitou a geração de rampas de temperatura com uma boa performance, atingindo até 500 °C com variações de até 2 °C ao utilizar taxas de aquecimento entre 0.5 °C/s e 5 °C/s. Calibrações do espectrômetro óptico utilizado na aquisição da luminescência e do sistema de irradiação foram executadas. Por fim, testes de aquisição de espectros de RL e TL foram realizados. Os testes de RL foram realizados utilizando vários materiais cujos espectros de emissão são bem conhecidos pela literatura, a saber, óxido de alumínio dopado com carbono Al2O3:C , oxisulfeto de gadolínio dopado com térbio Gd2O2S:Tb , óxido de ítrio dopado com európio Y2O3:Eu e borato de cálcio dopado com disprósio CaB6O10:Dy. Para o teste dos espectros de TL, o Al2O3:C foi utilizado. Os resultados dos espectros de RL e TL mostraram concordância com a literatura, indicando que o instrumento desenvolvido é comparável a outros instrumentos em operação de outros grupos, tornando os nossos resultados confiáveis.
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Chen, Geng, und 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.

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Chen, 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.

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Bücher zum Thema "Thermoluminescence dosimetry":

1

McKeever, S. W. S. Thermoluminescence dosimetry materials: Properties and uses. Ashford: Nuclear Technology Publishing, 1993.

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Horowitz, Y. S. Computerised glow curve deconvolution: Application to thermoluminescence dosimetry. Ashford: Nuclear Technology Publishing, 1995.

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Furetta, C. Questions and answers on thermoluminescence and optically stimulated luminescence. Hackensack, N.J: World Scientific, 2008.

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Chen, R. Thermally and optically stimulated luminescence: A simulation approach. Chichester, West Sussex, UK: Wiley, 2011.

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Kharita, Mohammad Hassan. Thermoluminescence and phototransfer thermoluminescence: Dosimetric characteristics and applications using natural and man-made materials. Birmingham: University of Birmingham, 1996.

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Mishev, Ilii͡a T. Fluoritŭt kato fosfor v radiotermoluminest͡sentnata dozimetrii͡a. Sofii͡a: Izd-vo na Bŭlgarskata akademii͡a na naukite, 1991.

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Fathony, Muhammad. Dosimetric characteristic studies of phototransfer thermoluminescence in natural quartz. Birmingham: University of Birmingham, 1992.

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Ranjbar, Abbas Hosseini. Dosimetric properties of clear fused quartz and CR-39 using electron spin resonance and thermoluminescence techniques. Birmingham: University of Birmingham, 1996.

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Chougaonkar, M. P. External gamma radiation monitoring in the environs of kaps region using thermoluminescent dosimeters, during the years 1986-2003. Mumbai: Bhabha Atomic Research Centre, 2004.

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Basu, A. S. External gamma radiation monitoring in the environs of Kaiga Generating Station (KGS), using thermoluminescent dosimeters, during the period 1989-2003. Mumbai: Bhabha Atomic Research Centre, 2005.

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Buchteile zum Thema "Thermoluminescence dosimetry":

1

Kron, Tomas, und Peta Lonski. „Thermoluminescence Dosimetry“. In Radiation Therapy Dosimetry: A Practical Handbook, 75–96. Names: Darafsheh, Arash, editor. Title: Radiation therapy dosimetry : a practical handbook / edited by Arash Darafsheh. Description: First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781351005388-6.

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Heffer, P. J. H., und T. A. Lewis. „The Use of Beryllium Oxide Thermoluminescence Dosemeters for Measuring Gamma Exposure Rates“. In Reactor Dosimetry, 373–79. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5378-9_36.

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Kron, T., M. Schneider und C. Amies. „Correlation Between the Dose Calculated from Plan and the Dose Measured with Thermoluminescence Dosimetry in Radiotherapy“. In Tumor Response Monitoring and Treatment Planning, 543–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-48681-4_89.

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Kessler, C., F. Stecher-Rasmussen, J. Rassow, S. Garbe und W. Sauerwein. „Application of Thermoluminescent Dosimeters to Mixed Neutron- Gamma Dosimetry for BNCT“. In Frontiers in Neutron Capture Therapy, 1165–73. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1285-1_178.

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Danilkin, M. I., N. Yu Vereschagina, A. S. Selyukov und D. I. Ozol. „Li2B4O7 for Thermoluminescent Dosimetry: A New Life of an Old Material“. In IFMBE Proceedings, 827–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31866-6_147.

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Abderrahim, H. Aït, E. D. McGarry und V. Spiegel. „Assessment of the Fast Neutron Sensitivity of Thermoluminescent Gamma Dosimeters“. In Proceedings of the Seventh ASTM-Euratom Symposium on Reactor Dosimetry, 529–36. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2781-3_61.

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Deme, S., und I. Apáthy. „Advanced Portable Thermoluminescent Dosimeter System for Monitoring Environmental Radiation“. In The Environmental Challenges of Nuclear Disarmament, 313–21. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4104-8_36.

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Rahimi, Seyed Ali. „Considering Dose Rate in Routine X-ray Examination by Thermoluminescent Dosimetry (TLD) in Radiology units of Mazandaran Hospitals“. In IFMBE Proceedings, 582–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-69367-3_155.

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Stock, T., M. Lüpke und H. Seifert. „The Lower Detection Limit of GR-200A and MCP-100D Thermoluminescence Dosimeters at Different Readout and Annealing Temperatures“. In IFMBE Proceedings, 315–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03902-7_89.

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Jain, Vinod K. „Photostimulated Thermoluminescence“. In Thermoluminescence and Thermoluminescent Dosimetry, 173–211. CRC Press, 2020. http://dx.doi.org/10.1201/9780429292248-4.

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Konferenzberichte zum Thema "Thermoluminescence dosimetry":

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Majchrowski, Andrzej. „Thermoluminescence in ionizing radiation dosimetry“. In Solid State Crystals: Materials Science and Applications, herausgegeben von Jozef Zmija. SPIE, 1995. http://dx.doi.org/10.1117/12.224985.

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Moscovitch, Marko, Anatoly Rosenfeld, Tomas Kron, Francesco d’Errico und Marko Moscovitch. „The Principles of Phototransferred Thermoluminescence“. In CONCEPTS AND TRENDS IN MEDICAL RADIATION DOSIMETRY: Proceedings of SSD Summer School. AIP, 2011. http://dx.doi.org/10.1063/1.3576175.

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Bhadane, Mahesh S., S. S. Dahiwale, V. N. Bhoraskar und S. D. Dhole. „Hydrothermally synthesized barium fluoride nanocubes for thermoluminescence dosimetry“. In DAE SOLID STATE PHYSICS SYMPOSIUM 2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4947803.

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Azorín Nieto, Juan. „Thermoluminescence Dosimetry (TLD) and its Application in Medical Physics“. In MEDICAL PHYSICS: Eighth Mexican Symposium on Medical Physics. AIP, 2004. http://dx.doi.org/10.1063/1.1811814.

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Furetta, C. „Fading Correction To Be Used In Clinical Thermoluminescence Dosimetry“. In MEDICAL PHYSICS: Eighth Mexican Symposium on Medical Physics. AIP, 2004. http://dx.doi.org/10.1063/1.1811820.

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Ghomeishi, Mostafa, Ghafour Amouzad Mahdiraji, Faisal Rafiq Mahamd Adikan und Suhairul Hashim. „The thermoluminescence response of undoped silica PCF for dosimetry application“. In 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). IEEE, 2013. http://dx.doi.org/10.1109/cleopr.2013.6600334.

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Horowitz, Yigal S., Hanan Datz, Anatoly Rosenfeld, Tomas Kron, Francesco d’Errico und Marko Moscovitch. „Thermoluminescence Dose Response: Experimental Methodology, Data Analysis, Theoretical Interpretation“. In CONCEPTS AND TRENDS IN MEDICAL RADIATION DOSIMETRY: Proceedings of SSD Summer School. AIP, 2011. http://dx.doi.org/10.1063/1.3576167.

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Vehar, David W., Patrick J. Griffin und Charles V. Holm. „THE USE OF ROBUST ESTIMATORS FOR REDUCING UNCERTAINTIES IN THERMOLUMINESCENCE DOSIMETER MEASUREMENTS“. In Proceedings of the 11th International Symposium on Reactor Dosimetry. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812705563_0058.

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Obryk, Barbara. „From nGy to MGy - New dosimetry with LiF:Mg,Cu,P thermoluminescence detectors“. In XXXV BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS. AIP, 2013. http://dx.doi.org/10.1063/1.4804076.

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Jyothi, K. R., K. R. Bhagya, H. Nagabhushana, A. P. Gnana Prakash, Vinayakprasanna N. Hegde und N. M. Nagabhushana. „Green synthesis and thermoluminescence study on LiAlSiO4:Ce3+ nanophosphors for dosimetry applications“. In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017190.

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Berichte der Organisationen zum Thema "Thermoluminescence dosimetry":

1

Aalbers, A. H. L., A. J. J. Bos und B. J. Mijnheer. NCS Report 3: Proceedings of the symposium on thermoluminescence dosimetry. Delft: NCS, Oktober 1988. http://dx.doi.org/10.25030/ncs-003.

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Durrer, Jr., Russell Edward. An evaluation of the Panasonic model UD513AC-1 Thermoluminescence Dosimetry system. Office of Scientific and Technical Information (OSTI), Dezember 1991. http://dx.doi.org/10.2172/10188840.

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Clark, Richard A. Intrinsic dosimetry. Properties and mechanisms of thermoluminescence in commercial borosilicate glass. Office of Scientific and Technical Information (OSTI), Oktober 2012. http://dx.doi.org/10.2172/1054849.

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Herminghuysen, Kevin Ryan. Development and evaluation of a neutron-gamma mixed-field dosimetry system based on a single thermoluminescence dosimeter. Office of Scientific and Technical Information (OSTI), Januar 1993. http://dx.doi.org/10.2172/10188779.

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Nugent, K. J., A. B. Ahmed und P. G. Groer. Evaluation of thermoluminescent dosimeters (TLDs) of two different designs for beta particle and low energy photon dosimetry. Office of Scientific and Technical Information (OSTI), November 1992. http://dx.doi.org/10.2172/6567527.

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Kinnison, R. Evaluation of environmental monitoring thermoluminescent dosimeter locations. Office of Scientific and Technical Information (OSTI), Dezember 1992. http://dx.doi.org/10.2172/138636.

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Shaw, K. R. Evaluation of discrepancies between thermoluminescent dosimeter and direct-reading dosimeter results. Office of Scientific and Technical Information (OSTI), Juli 1993. http://dx.doi.org/10.2172/10177407.

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Sonder, E., und A. B. Ahmed. Background radiation accumulation and lower limit of detection in thermoluminescent beta-gamma dosimeters used by the centralized external dosimetry system. Office of Scientific and Technical Information (OSTI), Dezember 1991. http://dx.doi.org/10.2172/10109602.

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Sonder, E., und A. B. Ahmed. Background radiation accumulation and lower limit of detection in thermoluminescent beta-gamma dosimeters used by the centralized external dosimetry system. Office of Scientific and Technical Information (OSTI), Dezember 1991. http://dx.doi.org/10.2172/5948905.

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Baumgartner, W. V., A. W. Endres und S. R. Reese. Quality control program for the Hanford External Dosimetry thermoluminescent processing system. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/7262866.

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