Yamamoto O, Yasuno Y, Minamide S, Hasegawa S, Tsutsui H, Takenaga M, Yamashita T
Health Phys. 1982 Sep;43(3):383-90. doi: 10.1097/00004032-198209000-00008.
A composite thermoluminescent dosimeter (TLD), composed of four, thin TL elements with a high-speed reader, has been developed by employing an optical-heating method. Each TL element, which is 15 mg/cm2 thick with a 3 mm dia., is prepared by applying Li2B4O7:Cu or CaSO4:Tm to a plastic substrate 14 mg/cm2 thick. Each element can be heated to 350 degree C within 0.8 sec. by IR radiation from a tungsten lamp. The characteristics of this TLD system include the following: (1) the detection limit of the Li2B4O7:Cu is 3 mR and the limit for CaSO4:Tm is 0.1 mR; (2) the energy-dependence curves are similar to the dose-equivalent curve, showing slight under-responses by 15% near 70 KeV for Li2B4O7:Cu and over-responses by 50% at high energies for CaSO4:Tm; (3) despite quick heating, the residual dose is as low as 0.1% of the last exposure signal; (4) responses are very stable for more than 1,000 cycles of repeated exposure readings; (5) no false signal could be detected, even in the cases of sweat or soil contamination; (6) the thin Li2B4O7;Cu element can be used for skin dose monitoring; and (7) the processing time of the automatic reader for the composite dosimeter is 3 hr/500 dosimeters. This TLD system can be applied to personnel dosimetry, gate monitoring and environmental monitoring.
一种复合热释光剂量计（TLD）已通过采用光热法研制而成，它由四个薄的热释光元件和一个高速读取器组成。每个热释光元件的厚度为15mg/cm²，直径为3mm，通过将Li₂B₄O₇:Cu或CaSO₄:Tm涂覆在厚度为14mg/cm²的塑料基板上制备而成。每个元件可通过钨灯的红外辐射在0.8秒内加热到350摄氏度。该TLD系统的特性如下：（1）Li₂B₄O₇:Cu的检测限为3mR，CaSO₄:Tm的检测限为0.1mR；（2）能量依赖曲线与剂量当量曲线相似，Li₂B₄O₇:Cu在70keV附近有15%的轻微响应不足，CaSO₄:Tm在高能时有50%的过响应；（3）尽管加热速度快，但残留剂量低至上次照射信号的0.1%；（4）在1000多次重复照射读数循环中，响应非常稳定；（5）即使在汗水或土壤污染的情况下也未检测到假信号；（6）薄的Li₂B₄O₇:Cu元件可用于皮肤剂量监测；（7）复合剂量计自动读取器的处理时间为3小时/500个剂量计。该TLD系统可应用于个人剂量测定、门监测和环境监测。
