Effect of high dose irradiation on thermoluminescence detector

国际生物医学工程杂志 Pub Date : 2019-08-28 DOI:10.3760/CMA.J.ISSN.1673-4181.2019.04.012

S. Ruan, Zhixin Zhao, Wen-yi Zhang, Kaijun Su, Xinxin Pang, F. Wang, Yulian Liu, Menghui Huo, Changxin Yan, L. Jiao

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Abstract

Objective To investigate effect of high dose irradiation on the performances of thermolumines- cence detectors (LiF:Mg, Cu, P). Methods The high-dose irradiated thermoluminescence detector was annealed by a thermoluminescence annealing furnace until the annealing was completed, and then the annealed thermoluminescent detector was irradiated 0.5Gy by 137Cs irradiator to verify the accuracy of the thermoluminescentdetector. Results The thermoluminescence detector after high-dose irradiation could not be completely annealed under the temperature condition of 240 °C, and it could be completely annealed at a high temperature as 400 ℃. After 0.5 Gy irradiation by 137Cs irradiator, the measurement results of the annealed thermoluminescence detector were significantly smaller, and the dose response and dispersion of the detector were also changed significantly. Conclusions After a more than 5 Gy irradiation, the crystal structure of the thermoluminescence detector has changed, and a high temperature peak above 240 ℃ has appeared, which leads to the failure to completely anneal at normal temperature. Therefore, the thermoluminescence detector can no longer be used for dosimetry after high-dose irradiation. Key words: Thermoluminescent detector; High dose; Annealing; Dose response

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高剂量辐照对热释光探测器的影响

目的研究高剂量辐照对LiF:Mg，Cu，P热发光探测器性能的影响。方法用热释光退火炉对大剂量辐照的热释光探测器进行退火，直至退火完成，然后用137Cs辐照器对退火后的热释发光探测器进行0.5Gy辐照，以验证热释光检测器的准确性。结果高剂量辐照后的热释光探测器在240°C的温度条件下不能完全退火，在400℃的高温条件下可以完全退火。经137Cs辐照器0.5Gy辐照后，退火后的热释光探测器的测量结果明显较小，探测器的剂量响应和色散也发生了显著变化。结论在5Gy以上辐照后，热释光探测器的晶体结构发生了变化，出现了240℃以上的高温峰，导致在常温下不能完全退火。因此，热释光探测器在大剂量辐照后不能再用于剂量测定。关键词：热发光探测器；高剂量；退火；剂量反应

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国际生物医学工程杂志

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1974