Measurement and analysis of radiation dose for 125I seed source production radiation workers in an enterprise
10.3760/cma.j.cn112271-20240102-00002
- VernacularTitle:某企业 125I粒籽源生产过程中放射工作人员受照剂量测量与分析
- Author:
Qinghua MENG
1
;
Yuxia KONG
1
;
Bin BAI
1
;
Yongzhong MA
1
Author Information
1. 北京市疾病预防控制中心放射卫生防护所，北京 100013
- Publication Type:Journal Article
- Keywords:
125I seed source;
Radionuclide;
Gamma spectrometry;
External exposure;
Internal exposure
- From:
Chinese Journal of Radiological Medicine and Protection
2025;45(1):49-55
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the doses received by radiation workers from external and internal exposures during the production of 125I seed source, and to provide scientific basis for accurate evaluation of the annual doses of radiation workers. Methods:The production site and radiation workers of a 125I seed source production enterprise were determined as the survey objects. An AT1121 X/γ dosimeter was used to measure the ambient dose equivalent rate on the operation site such as welding and cleaning of the seed source, and the dose received by workers from external exposure was estimated. LiF (Mg, Cu, P) TLD dosimeters were used to measure the external doses to workers in a specific period. The doses obtained by the two method were compared and analyzed. The RG-50 air sampler and TC-30 iodine box were used to collect the workplace air, The activity concentration of 125I in the air was measured by using of the BE5030 high-purity germanium gamma spectrometer to estimate the internal dose to workers. The evaluation of doses was performed in accordance with the national standards GBZ 128-2019 and GBZ 129-2016. Results:The estimated annual dose to the worker′ hands is 24.5 mSv/year. The estimated maximum dose was 2.61 mSv/year. The maximum value of individual dose monitored was 2.42 mSv/year, basically consistent with the measured value on the basis of considering the actual work rotation. The maximum estimate of committed effective dose from internal exposure was 1.55 mSv, by a factor of up to 17 times the estimated external dose at the corresponding post.Conclusions:The radiation dose to the radiation workers’ hands is relatively high in the production of 125I seed source, so the protective measures for hands should be effectively strengthened. Meanwhile, the internal dose to the workers in the production process of 125I seed source should not be negelected. The ventilation of the site should be strengthened, the air flow direction should be planned, and the 125I activity concentration in the air should be regularly monitored.
