摘要
目的调查北京地区19处土壤中放射性核素的含量,为准确评价北京地区环境放射性污染提供科学依据。方法2017—2018年连续采集北京16个区的38份土壤样品,使用GEM-MX7080P4型高纯锗γ能谱仪对样品中放射性核素226Ra、232Th、40K和137Cs的比活度进行监测。结果19处土壤样品中放射性核素226Ra、232Th、40K的比活度平均值连续两年分别为23.9和24.1 Bq/kg、31.2和31.7 Bq/kg、600和578 Bq/kg;137Cs的比活度平均值两年均为1.21 Bq/kg,最高值分别为5.48和6.18 Bq/kg,约为当年平均值的4.5和5.1倍。结论北京地区19处土壤样品中226Ra、232Th、40K和137Cs的含量在本地区和国内环境本底范围内,土壤中137Cs主要来源于既往的核活动或核事故。
Objective To investigate radionuclide content in soil at 19 spots in Beijing,in order to provide scientific basis for the accurate evaluation of the levels of radioactive contamination.Methods GEM-MX7080P4 HPGeγspectrometer was used to analyse the activity concentrations of radionuclide 226Ra,232Th,40K and 137Cs in all 38 soil samples from 16 districts of Beijing from 2017 to 2018.Results The mean activity concentration of 226Ra,232Th and 40K were 23.9 and 24.1 Bq/kg,31.2 and 31.7 Bq/kg,600 and 578 Bq/kg respectively for the two consecutive years.The mean activity concentration of 137Cs in the two years was 1.21 Bq/kg,with the highest values of 5.48 and 6.18 Bq/kg,about 4.5 times and 5.1 times the average values in those years.Conclusions All the result are within the range of the values from previous Beijing municipal and countrywide survey of environmental background,with 137Cs in soil arising almost from the previous nuclear activities or nuclear incidents.
作者
孟庆华
马永忠
王欢
孔玉侠
娄云
白斌
Meng Qinghua;Ma Yongzhong;Wang Huan;Kong Yuxia;Lou Yun;Bai Bin(Radiation Protection Institute,Beijing Center for Disease Control and Prevention,Beijing Center for Preventive Medicine Research,Beijing 100013,China)
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2020年第9期702-706,共5页
Chinese Journal of Radiological Medicine and Protection
