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Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors

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CaSO₄:Tm thermoluminescent semi-spherical-shaped pellets for improved angular dependence dosimeters.

Ivón Oramas Polo¹, Cassiana Viccari¹, Luiza Cotrim¹

¹Centre for Instrumentation, Dosimetry and Radioprotection (CIDRA), Department of Physics, Faculty of Philosophy, Sciences and Letters at Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto, SP, 14040-901, Brazil.

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Summary

New semi-spherical thermoluminescent (TL) pellets made of CaSO4:Tm offer improved angular dependence for personal dosimetry applications. These pellets demonstrate good sensitivity and reproducibility, making them suitable for radiation monitoring.

Keywords:

Angular dependence CaSO(4):Tm Thermoluminescent dosimetry

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Area of Science:

Medical Physics
Radiation Detection and Measurement

Background:

Angular dependence of thermoluminescent (TL) pellets poses challenges in thermoluminescent dosimetry (TLD), particularly for personal dosimetry.
Conventional cylindrical pellets exhibit significant angular dependency, impacting dose accuracy.

Purpose of the Study:

To develop and evaluate semi-spherical CaSO4:Tm pellets for personal dosimetry.
To improve angular dependence and assess dosimetric properties compared to cylindrical pellets.

Main Methods:

Semi-spherical CaSO4:Tm pellets (27 mg, 2:1 PTFE to phosphor ratio) were fabricated.
Pellets were irradiated with 137Cs source (0.5-50 mGy) to study sensitivity and dose response.
Angular dependence was evaluated by comparing readings at different angles relative to 0°.

Main Results:

Pellets showed dosimetric peaks at ~300°C and ~200°C.
Linear dose-response observed from 0.5 to 50 mGy.
Sensitivity: (58.8 ± 2.0) nC/mGy; Lower Detection Limit: (0.037 ± 0.001) mGy.
Semi-spherical pellets exhibited significantly better angular dependence (max 4.6% difference) than cylindrical ones (max 32% difference) up to 90°.

Conclusions:

Semi-spherical CaSO4:Tm (2:1) pellets show promise as TL detectors for personal monitoring.
Improved angular dependence enhances accuracy in personal dosimetry applications.
The developed pellets offer a viable alternative to conventional cylindrical TLDs.