| Huang Lihua,Zheng Qishan,Zhang Yan,et al.Investigation of two types of portable γ spectrometer applicability for measurement of thyroid131I activity and internal doses to radiation workers[J].Chinese Journal of Radiological Medicine and Protection,2022,42(4):297-302 |
| Investigation of two types of portable γ spectrometer applicability for measurement of thyroid131I activity and internal doses to radiation workers |
| Received:November 23, 2021 |
| DOI：10.3760/cma.j.cn112271-20211123-00460 |
| KeyWords:Portable γ spectrometer|HPGe|LaBr3(Ce)|Internal exposure|131I |
| FundProject:福建省自然科学基金（2019J01094） |
| Author Name | Affiliation | E-mail | | Huang Lihua | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou 350025, China | | | Zheng Qishan | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou 350025, China | | | Zhang Yan | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou 350025, China | | | Zheng Senxin | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou 350025, China | | | Qing Yunhua | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou 350025, China | | | Wei Weiqi | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou 350025, China | fjwq2002@163.com |
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| Abstract:: |
| Objective To investigate the differences in applicability of both the portable high-purity germanium (HPGe) γ spectrometer and the portable lanthanum bromide (LaBr) γ spectrometer for measuring thyroid 131I activity and internal exposure monitoring for radiation workers. Method Both DETECTIVE-DX100-KT portable HPGe γ spectrometer and InSpector 1000 portable LaBr γ spectrometer were used to measure the131I content in thyroid of radiation workers for comparison of the measuring result, minimum detectable activity (MDA) and corresponding annual committed effective doses between two types of spectrometers.Results The detection rate of 131I in thyroid of radiation workers was 67.7% for HPGe γ spectrometer and 26.2% for LaBr γ spectrometer, respectively. The MDA was 12.26-14.74 Bq (measuring time:3-5 min) for HPGe γ spectrometer and 56.56-80.37 Bq for LaBr γ spectrometer (measuring time:2-4 min). The annual committed effective dose corresponding to MDA was 0.07-0.08 mSv (3-5 min) for HPGe and 0.31-0.45 mSv (2-4 min) for LaBr, respectively, in the case of using chronic continuous intake mode and 7 d monitoring period.Conclusions The minimum detectable activity (MDA) of the two types of portable spectrometers could meet the requirements specified in GBZ 129-2016 Specifications for individual monitoring of occupational internal exposure for thyroid monitoring equipment. The two types of spectrometers could be used for routine monitoring of internal contamination. The difference between the monitoring result of LaBr γ and HPGe γ spectrometers might be due to such factors as large uncertainty in short measuring time and low activity concentrations, incomplete identical of distance between probe and neck, probe angle setting, different response of equipment to the environment, background deduction method. |
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