Effect of high dose irradiation on thermoluminescence detector
10.3760/cma.j.issn.1673-4181.2019.04.012
- VernacularTitle:大剂量照射对热释光探测器的影响分析
- Author:
Shuzhou RUAN
1
;
Zhixin ZHAO
;
Wenyi ZHANG
;
Kaijun SU
;
Xinxin PANG
;
Fang WANG
;
Yulian LIU
;
Menghui HUO
;
Changxin YAN
;
Ling JIAO
Author Information
1. 中国医学科学院 北京协和医学院放射医学研究所
- Keywords:
Thermoluminescent detector;
High dose;
Annealing;
Dose response
- From:
International Journal of Biomedical Engineering
2019;42(4):342-345
- CountryChina
- Language:Chinese
-
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 ℃, 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.
