Radiation safety analysis of retrieval and conditioning of naturally occurring radioactive material waste
10.13491/j.issn.1004-714X.2023.05.010
- VernacularTitle:伴生放射性废物回取整备的辐射安全分析
- Author:
Zhanjun XIE
1
;
Yueyin ZHAN
1
;
Hefei ZHANG
1
Author Information
1. The Fourth Research and Design Engineering Corporation of CNNC, Shijiazhuang 050021 China.
- Publication Type:OriginalArticles
- Keywords:
Thorium series;
Radiation protection;
Point kernel integration method;
External irradiation
- From:
Chinese Journal of Radiological Health
2023;32(5):527-531
- CountryChina
- Language:Chinese
-
Abstract:
Objective The radioactivity level in historical waste from a plant is high, and decommissioning operators may be exposed to high radiation doses. The objective of the study is to carry out a radiation safety analysis of the retrieval and conditioning of naturally occurring radioactive material (NORM) waste, put forward appropriate radiation protection measures, and minimize the exposure doses of operators. Methods The source terms of NORM waste in the temporary storehouse were analyzed; MicroShield, a point kernel integration program, was used for modeling and calculation; and radiation protection measures under decommissioning conditions were put forward based on on-site monitoring data. Results The maximum gamma dose rate calculated near the waste pile in the temporary storehouse was 313.9 μGy/h, equivalent to the monitoring level; distance decay and appropriate shielding measures significantly reduced gamma dose rates for operators. Conclusion Decommissioning sites of temporary storehouses are of great harm to operators. Measures such as shielding, isolation, remote operations, and personal protection can effectively reduce the exposure doses of operators.
