Thermoluminescence Dosemeter for Equivalent Dose Assessment in a Mixed Beta and Gamma Field

Daltro, T.F.L.; Campos, L.L.; Perez, Horacio

doi:10.1093/oxfordjournals.rpd.a032821

Cited by 4 publications

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“…The active material for thermoluminescence is CaSO 4 :Dy crystals inside a polytetrafluorethilene (PTFE) matrix. Their dosimetric characteristics are recognized (Campos, 1983;Campos & Lima, 1986) and they are sensitive to beta radiation too (Daltro et al, 1999;Campos & Rosa, 1988;Campos & Rosa, 1988b;Campos & Lima, 1987;Campos & Lima, 1987b;. Thermoluminescent response of detectors, called "readings", were made in TL reader Harshaw model 2000.…”

Section: Methodsmentioning

confidence: 99%

Absorbed dose measurements using TLDS in biological samples from beta radiation

Manzoli

Carvalho

Cerqueira

2006

Braz. arch. biol. technol.

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Section: Methodsmentioning

confidence: 99%

Absorbed dose measurements using TLDS in biological samples from beta radiation

Manzoli

Carvalho

Cerqueira

2006

Braz. arch. biol. technol.

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Thermoluminescence, ESR and x-ray diffraction studies of CaSO₄ : Dy phosphor subjected to post preparation high temperature thermal treatment

Bakshi¹,

Patwe²,

Bhide³

et al. 2007

J. Phys. D: Appl. Phys.

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Thermoluminescence (TL), electron spin resonance (ESR) and x ray diffraction studies of CaSO4 : Dy phosphor subjected to post preparation high temperature treatment were carried out. Analysis of the TL glow curve indicated that the dosimetric glow peak at 240 °C reduces, whereas the low temperature satellite peak increases with the increase in the annealing temperature in the range 650–1000 °C. The influence of the annealing atmosphere on the TL glow curve structure was also observed. Reduction of the photoluminescence intensity of the annealed phosphor indicated that the environment of Dy3+ ions might have undergone some change due to high temperature treatment. Reduction in the ESR signal intensity corresponding to and radicals was observed initially with the increase in the annealing temperaure; subsequently their intensity increased with temperature. Signals due to the radical vanished, when the phosphor was annealed beyond 800 °C. A signal corresponding to SH2− radicals was also observed in the ESR spectra for samples subjected to annealing in the temperature regime 800–1000 °C. XRD of the in situ annealed phosphor showed a change in the unit cell parameters. An endothermic peak at 860 °C in the DTA spectrum was observed.

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Correlation of phase transition with the change in TL characteristics in CaSO4:Dy phosphor—effect of thermal treatment

Bakshi¹,

Pradhan²,

Tyagi³

et al. 2006

Radiation Protection Dosimetry

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The study is aimed at optimising the glow curve structure of CaSO4:Dy phosphor for dosimetric purpose and also to understand the observed changes owing to thermal treatment in the thermoluminescence (TL) sensitivity and glow curve structure. The reversible changes in the intensities of the lower temperature satellite peak and the main dosimetric glow peak with temperature of thermal treatment in the temperature range 400-700 degrees C indicates the interconversion of defect complexes responsible for the glow peaks in CaSO4:Dy. Phosphor samples subjected to thermal treatment in temperature range beyond 800 degrees C, showed irreversible changes in the intensities of the lower temperature and dosimetric peaks. The changes in TL characteristics of the phosphor for thermal treatments >800 degrees C are attributed to the partial phase transition in the phosphor as confirmed by the XRD and TG/DTA analysis of the phosphor.

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Thermoluminescence Dosemeter for Equivalent Dose Assessment in a Mixed Beta and Gamma Field

Cited by 4 publications

References 0 publications

Absorbed dose measurements using TLDS in biological samples from beta radiation

Absorbed dose measurements using TLDS in biological samples from beta radiation

Thermoluminescence, ESR and x-ray diffraction studies of CaSO₄ : Dy phosphor subjected to post preparation high temperature thermal treatment

Correlation of phase transition with the change in TL characteristics in CaSO4:Dy phosphor—effect of thermal treatment

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Thermoluminescence Dosemeter for Equivalent Dose Assessment in a Mixed Beta and Gamma Field

Cited by 4 publications

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Absorbed dose measurements using TLDS in biological samples from beta radiation

Absorbed dose measurements using TLDS in biological samples from beta radiation

Thermoluminescence, ESR and x-ray diffraction studies of CaSO4 : Dy phosphor subjected to post preparation high temperature thermal treatment

Correlation of phase transition with the change in TL characteristics in CaSO4:Dy phosphor—effect of thermal treatment

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Thermoluminescence, ESR and x-ray diffraction studies of CaSO₄ : Dy phosphor subjected to post preparation high temperature thermal treatment