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热释光探测器(TLD)在人体及环境辐射监测、食品辐照剂量学和治疗剂量学等的研究中已得到广泛应用。在放射生物学实验中,TLD的优点之一是可以制成各种形状和不同厚度的探测元件,以适用于动物或模型体内吸收剂量分布的测量。但是由于含较高原子序数的CaSO_4磷光体在模体中对低能散射光子的过响应,使得实验结果处理较为复杂。据文献[2]报道,对较大的~(60)Co辐照场,模型中由散射产生的低于200keV光子,使位于模型中心的CaSO_4:Dy的过响应达10％。然而若将CaSO_4材料制成极薄的TLD(其厚度远小于次级电子在组织等
Thermoluminescence detector (TLD) has been widely used in the research of human and environmental radiation monitoring, food irradiation dosimetry and therapeutic dosimetry. In radiobiological experiments, one of the advantages of TLDs is the ability to make detection elements of various shapes and thicknesses for the measurement of absorbed dose distribution in animals or models. However, due to the over-response of CaSO 4 phosphors with higher atomic number to low-energy scattering photons in the mold, the experimental results are more complicated. According to [2], the over-response of CaSO_4: Dy located in the center of the model is reported to be 10% for the larger ~ (60) Co radiation field with less than 200keV photons due to scattering. However, if the CaSO 4 material is made very thin TLD (its thickness is much smaller than the secondary electrons in the tissue, etc.