| 孟庆华,马永忠,王欢,等.2017—2018年北京地区土壤的放射性水平监测与分析[J].中华放射医学与防护杂志,2020,40(9):702-706.Meng Qinghua,Ma Yongzhong,Wang Huan,et al.Monitoring and analysis of radioactivity in soils in Beijing during 2017-2018[J].Chin J Radiol Med Prot,2020,40(9):702-706 |
| 2017—2018年北京地区土壤的放射性水平监测与分析 |
| Monitoring and analysis of radioactivity in soils in Beijing during 2017-2018 |
| 投稿时间：2019-12-16 |
| DOI：10.3760/cma.j.issn.0254-5098.2020.09.009 |
| 中文关键词: 北京地区 土壤 放射性核素 γ能谱 |
| 英文关键词:Beijing area Soil Radionuclide γ spectrometry |
| 基金项目: |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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. MethodsGEM-MX7080P4 HPGe γ spectrometer 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. |
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