Abstract Thermoluminescent dosimeters are widely used in radiation dosimetry, including low dose applications such as personal dosimetry. This work aimed to manufacture thermoluminescent pellets using CaSO4:Tm; CaSO4:Dy,Tm; CaSO4:Dy, Tb and CaSO4:Dy, Eu phosphors and to study their dosimetric properties in comparison to commercially available CaSO4:Dy (TLD-900). The phosphors were synthesized by the slow evaporation route using a solution of sulfuric acid, calcium carbonate and the dopants. The pellets were manufactured using Teflon as aggregate agent. The glow curves of the different pellets were measured and the integral of the dosimetric peak was used as the dosimetric response for each material. The dose-response curves were measured in a dose range of 100 μG y to 50 mGy by 137Cs (γ-source) and X-rays (30 kVp up to 120 kVp). The energy dependence and fading of the pellets were also studied. Groups of 30 pellets were used to investigate the response homogeneity for the studied materials. The glow curves for all the studied materials (excluding CaSO4:Eu) showed the maximum luminescent emission at around 260 °C, but with different intensities. The CaSO4:Tm pellets showed the highest thermoluminescent emission among the studied materials. All the materials showed a linear response in the studied dose range, with CaSO4:Tm pellets showing the highest sensitivity at all radiation qualities. The highest energy dependence was found for the ISO N-40 beam quality (40 kVp X-rays) for all materials when compared to irradiations by the 137Cs source. A 7.7% fading for the CaSO4:Tm was found for a period of two months. All the manufactured pellets showed better dosimetric properties than the studied standard CaSO4:Dy.

中文翻译：

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低剂量稀土掺杂 CaSO4 热释光球团的剂量学特性

摘要 热释光剂量计广泛用于辐射剂量测定，包括个人剂量测定等低剂量应用。这项工作旨在使用 CaSO4:Tm 制造热释光颗粒；CaSO4:Dy,Tm; CaSO4:Dy、Tb 和 CaSO4:Dy、Eu 荧光粉并研究它们的剂量学特性，并与市售 CaSO4:Dy (TLD-900) 进行比较。使用硫酸、碳酸钙和掺杂剂的溶液通过缓慢蒸发路线合成磷光体。使用聚四氟乙烯作为聚集剂制造颗粒。测量不同丸粒的辉光曲线，并将剂量测定峰的积分用作每种材料的剂量测定响应。通过 137Cs（γ 源）和 X 射线（30 kVp 至 120 kVp）在 100 μG y 至 50 mGy 的剂量范围内测量剂量反应曲线。还研究了颗粒的能量依赖性和褪色。使用 30 个颗粒为一组来研究所研究材料的响应均匀性。所有研究材料（不包括 CaSO4:Eu）的辉光曲线在 260 °C 左右显示出最大发光发射，但强度不同。CaSO4:Tm 颗粒在所研究的材料中显示出最高的热释光发射。所有材料在所研究的剂量范围内都显示出线性响应，其中 CaSO4:Tm 颗粒在所有辐射质量下显示出最高的灵敏度。与 137Cs 源的辐照相比，所有材料的 ISO N-40 光束质量（40 kVp X 射线）的能量依赖性最高。发现 CaSO4:Tm 在两个月内衰减了 7.7%。