The effect of thermal annealing on defect structure and thermoluminescence in LiF:Mg,Cu,P

Mahajna, S.; Yossian, D.; Horowitz, Y.S.

doi:10.1016/1350-4487(95)00014-6

Cited by 12 publications

(2 citation statements)

References 14 publications

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“…All measurements were conducted in a nitrogen atmosphere with low constant heating rate of 1 K/s and 513.15 K maximum temperature avoid sensitivity changes due to high annealing temperature. The annealing before irradiation was done using the procedure: 10 minutes heating in oven at 513.15 K, cooling at room temperature [23]. In laboratory measurement, room lighting is provided by Illford DL10 lamps equipped with Ilford #902 filters [18,19] in order to minimize the effects of optical bleaching [24].…”

Section: Methodsmentioning

confidence: 99%

QA for calibration procedures of TLDs 100H in low doses range

et al. 2019

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Aim of this work is evaluate the performance of LiF detectors, TLD-100H, used for both environmental and radiodiagnostic dosimetry. General-Order kinetics (GOK) expressions were applied to experimental glow curves of TLDs 100H (LiF. Mg, P, Cu), that were irradiated with an X-ray tube at 140 kVp and reading with a Riso TL/OSL-DA-10 system. New tests were introduced such as the Recuperation test, for evaluate the residual luminescent after each measurement cycle, the Recycling test, aimed to evaluate any systematic errors in the calibration curve and, at last, the Recovery test, with the purpose of evaluate the accuracy of the measured dose from each single dosimeter. The results obtained show an accuracy on the various measured doses ranging from 1.20% to 2.56%.

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Section: Methodsmentioning

confidence: 99%

QA for calibration procedures of TLDs 100H in low doses range

et al. 2019

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“…The TLDs signals after irradiation were acquired with a heating rate of 1 K/s from RT to 513.15 K in a nitrogen atmosphere, in order to prevent sensitivity changes due to high temperature. The signal bleaching before irradiation was performed by heating the TLD in the oven at 513.15 K for 10 min and by cooling it down at room temperature [17,18]. During the luminescence acquisitions, the laboratory was illuminated by using Ilford DL10 lamps filtered with Ilford #902 [19,20] in order to avoid any optical bleaching [20].…”

Section: Calibration Dosimeter Proceduresmentioning

confidence: 99%

CT-Dose Measurement of the Spinal Cord Region Using XR-QA2 Radiochromic Films and TLD 100H Dosimeters

et al. 2020

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The European Directive 2013/59/Euratom focuses on the radiation protection and patient dosimetry. In particular, the dose absorbed by serial organs such as the spinal cord due to diagnostic exams plays a crucial role in the appraisal of medical exposure. In this work, a comparison between dose measurements performed with GafchromicTM XR-QA2 and TLD 100H is presented. The dosimeters—after a calibration procedure through an X-ray tube—were placed within the thorax region of an anthropomorphic phantom corresponding to the spinal cord area exposed to a thoracic CT procedure. The mean-dose value was measured with GafchromicTM first, and it was then compared to the dose value obtained with TLDs, resulting in a good agreement between the two dosimetric methodologies. Additionally, the results showed that—due to the usage of the automatic exposure control (EC) system—the discrepancy between the two methods is proportional to the current output of the CT system.

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Synthesis and thermoluminescence characterizations of Sr₂B₅O₉Cl:Dy³⁺ phosphor for TL dosimetry

Oza

Dhoble²,

Park

et al. 2014

Luminescence

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The photoluminescence (PL) and thermoluminescence (TL) displayed by Dy-activated strontium haloborate (Sr2 B5 O9 Cl) were studied. A modified solid-state reaction was employed for the preparation of the phosphor. Photoluminescence spectra showed blue (484 nm) and yellow (575 nm) emissions due to incorporation of Dy(3+) into host matrix. The Dy-doped (0.5 mol%) Sr2 B5 O9 Cl was studied after exposure to γ-irradiation and revealed a prominent glow curve at 261°C with a small hump around 143°C indicating that two types of traps were generated. The glow peak at the higher temperature side (261°C) was more stable than the lower temperature glow peak. The TL intensity was 1.17 times less than that of the standard CaSO4 :Dy thermoluminescence dosimetry (TLD) phosphor, the phosphor showed a linear dose-response curve for different γ-ray irradiation doses (0.002-1.25 Gy) and fading of 5-7% was observed for higher temperature peaks upon storage. Trapping parameters and their estimated error values have been calculated by Chen's peak shape method and by the initial rise method. Values of activation energies estimated by both these techniques were comparable. The slight difference in activation energy values calculated by Chen's peak shape method indicated the formation of two kinds of traps Furthermore, slight differences in frequency values are due to various escaping and retrapping probabilities.

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The effect of thermal annealing on defect structure and thermoluminescence in LiF:Mg,Cu,P

Cited by 12 publications

References 14 publications

QA for calibration procedures of TLDs 100H in low doses range

QA for calibration procedures of TLDs 100H in low doses range

CT-Dose Measurement of the Spinal Cord Region Using XR-QA2 Radiochromic Films and TLD 100H Dosimeters

Synthesis and thermoluminescence characterizations of Sr₂B₅O₉Cl:Dy³⁺ phosphor for TL dosimetry

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The effect of thermal annealing on defect structure and thermoluminescence in LiF:Mg,Cu,P

Cited by 12 publications

References 14 publications

QA for calibration procedures of TLDs 100H in low doses range

QA for calibration procedures of TLDs 100H in low doses range

CT-Dose Measurement of the Spinal Cord Region Using XR-QA2 Radiochromic Films and TLD 100H Dosimeters

Synthesis and thermoluminescence characterizations of Sr2B5O9Cl:Dy3+ phosphor for TL dosimetry

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Product

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Synthesis and thermoluminescence characterizations of Sr₂B₅O₉Cl:Dy³⁺ phosphor for TL dosimetry