辐射防护 ›› 2023, Vol. 43 ›› Issue (4): 318-324.

• 辐射防护评价 • 上一篇    下一篇

某核设施周围土壤中137Cs放射性水平及所致居民外照射剂量评价

李立凡1,2, 文富平1, 胡翔2, 李慧萍2   

  1. 1.中国原子能科学研究院,北京 102413;
    2.北京市核与辐射安全中心,北京 100089
  • 收稿日期:2022-04-26 出版日期:2023-07-20 发布日期:2023-07-25
  • 通讯作者: 文富平。E-mail:176512@qq.com
  • 作者简介:李立凡(1994—),男,2016年本科毕业于西南科技大学国防科技学院核化工与核燃料工程专业,2019年硕士毕业于东华理工大学核科学与工程学院核科学与技术专业,在读博士研究生。E-mail: 1181053930@qq.com

Evaluation of 137Cs radioactivity level and the induced resident external exposure dose in soils surrounding a nuclear facility

LI Lifan1,2, WEN Fuping1, HU Xiang2, LI Huiping2   

  1. 1. China Institute of Atomic Energy, Beijing 102413;
    2. Nuclear and Radiation Safety Center of Beijing, Beijing 100089
  • Received:2022-04-26 Online:2023-07-20 Published:2023-07-25

摘要: 137Cs是核设施环境监测中重点关注的人工放射性核素。对2012—2021年某核设施周围土壤中137Cs放射性水平进行了统计分析,与同类核设施进行了对比,建立了一套针对土壤中137Cs所致居民外照射剂量的本底扣除方法,估算了该核设施周围土壤中137Cs 所致居民外照射剂量。结果表明:2012—2021年期间该核设施周围土壤样品中137Cs的活度浓度平均值呈现出先下降后回升的趋势,近10年平均值1.81 Bq/kg,略高于同类核设施。从监测点位来看,137Cs活度浓度平均值较高的6个点位中有4个分布在该核设施周围2 km半径内。该核设施周围土壤样品中的137Cs所致居民年均外照射有效剂量为1.32 μSv,仅为核设施公众年剂量目标值的0.5%。

关键词: 土壤, 137Cs, 外照射, 评价

Abstract: 137Cs is an artificial radionuclide that has been paid special attention in environmental monitoring of nuclear facilities. In this paper, the 137Cs radioactivity level in soils around a nuclear facility was statistically analyzed, and was compared with similar nuclear facilities from 2012 to 2021. The background deduction method was established for the external radiation dose caused by 137Cs in soils, and the resident external radiation dose caused by 137Cs in soils around the nuclear facility was estimated. The results showed that the activity concentration of 137Cs in soil samples around the nuclear facility decreased first and then increased from 2012 to 2021, and the average activity concentration of 1.81 Bq/kg in recent ten years was slightly higher than that of similar nuclear facilities. From the point of view of monitoring locations, four of the six locations with the highest average 137Cs activity concentration are distributed within a 2 km radius of the nuclear facility. The annual effective dose caused by 137Cs from soil samples around the nuclear facility was 1.24 μSv, which was only 0.5% of the target annual dose for the public specified for the nuclear facility.

Key words: soil, cesium-137, external exposure, evaluation

中图分类号: 

  • TL75