Dosimetric Properties of CaSO4:Dy Teflon Pellets Produced at IPEN

Campos, L.L.; Lima, Maria Alice Dias da Silva

doi:10.1093/oxfordjournals.rpd.a079666

Cited by 43 publications

(17 citation statements)

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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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“…For the exposure levels in the radiation protection applications range, the dose response of the main TL peak (240 C) is found to be linear up to 10 Gy (Campos and Lima, 1986). However, supralinear response with dose is reported in the dose range 10 Gye5.0 kGy at room temperature irradiation (ISO/ASTM 51956).…”

Section: Introductionmentioning

confidence: 99%

TL and EPR studies of CaSO4:Dy phosphor to investigate its efficacy in measurement of food irradiation dose at sub-ambient temperatures

Sanyal

Natarajan

Chawla

et al. 2010

Radiation Measurements

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“…In Brazil, the Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN) produces dosimeters of calcium sulfide activated with dysprosium (CaSO 4 :Dy). This material is quite sensitive to radiation, however, it has a high atomic number (Z ef = 14.4) and for this reason it presents a high dependence on the radiation energy, particularly up to 100 keV (10,11) . The aim of the present study was to evaluate the behavior of three thermoluminescent materials widely utilized in dosimetry of X and gamma radiations (LiF:Mg,Ti; LiF:Mg,Cu,P; and CaSO 4 :Dy) on different X radiation beams and the implications in the entrance skin dose estimation in patients submitted to diagnostic radiology procedures (conventional radiology, mammography and dental radiology).…”

Section: Introductionmentioning

confidence: 99%

Influência da dependência energética de dosímetros termoluminescentes na medida da dose na entrada da pele em procedimentos radiográficos

et al. 2010

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OBJECTIVE: This study was aimed at evaluating the influence of the energy dependence of thermoluminescent materials on the determination of entrance skin dose in patients submitted to conventional radiographic studies (general radiology, mammography and dental radiology). MATERIALS AND METHODS: Three different thermoluminescent materials were utilized: LiF:Mg,Ti, LiF:Mg,Cu,P and CaSO 4 :Dy. These materials were exposed to standardized sources of X and gamma radiation and clinical X-ray beams. RESULTS: Calibration and energy dependence curves were obtained. All the materials showed a linear response as a function of the air kerma. As far as energy dependence is concerned, the CaSO 4 :Dy and LiF:Mg,Ti samples showed the greatest variation on thermoluminescent responses as a function of the effective radiation beam. CONCLUSION: The tested materials showed an appropriate performance for detecting X radiation on standard and clinical X-ray beams. Although CaSO 4 :Dy and LiF:Mg,Ti samples present a significant energy dependence in the considered energy range, these materials can be utilized for measuring entrance skin doses, provided appropriate correction factors are applied. Keywords: Thermoluminescent dosimeters; X-ray; Radiation protection; Entrance skin dose.OBJETIVO: O objetivo do presente trabalho foi avaliar a influência da dependência energética de materiais termoluminescentes na determinação da dose na entrada da pele de pacientes submetidos a exames radiográficos (radiologia geral, mamografia e radiologia odontológica). MATERIAIS E MÉTODOS: Três diferentes materiais termoluminescentes foram utilizados: LiF:Mg,Ti, LiF:Mg,Cu,P e CaSO 4 :Dy. Estes materiais foram expostos a fontes padronizadas de radiação X e gama, e a feixes clínicos de raios X. RESULTADOS: As curvas de calibração e de dependência energética foram obtidas. Todos os materiais apresentaram resposta linear em função do kerma no ar. Com relação à dependência energética, as amostras de CaSO 4 :Dy e LiF:Mg,Ti mostraram maior variação da resposta termoluminescente em função da energia efetiva do feixe de radiação. CONCLUSÃO: Os materiais testados mostraram desempenho adequado para a detecção da radiação X em feixes padronizados e clínicos. Embora as amostras de CaSO 4 :Dy e LiF:Mg,Ti apresentem dependência energética significativa no intervalo de energia considerado, este materiais podem ser utilizados para medição da dose de entrada na pele se fatores de correção apropriados forem utilizados. Unitermos: Dosímetros termoluminescentes; Raios X; Proteção radiológica; Dose na entrada da pele. AbstractResumo

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Dosimetric Properties of CaSO4:Dy Teflon Pellets Produced at IPEN

Cited by 43 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

TL and EPR studies of CaSO4:Dy phosphor to investigate its efficacy in measurement of food irradiation dose at sub-ambient temperatures

Influência da dependência energética de dosímetros termoluminescentes na medida da dose na entrada da pele em procedimentos radiográficos

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