丹东地区土壤天然放射性核素本底值调查研究

Study on background value of soil natural radionuclides in Dandong area

为明确丹东地区土壤天然放射性核素226 Ra、232 Th、40 K的本底值,以丹东地区代表性土壤为研究对象,使用RMS 4096-USB数字化低本底多道r能谱仪测定其0~10 cm土层226 Ra、232 Th、40 K放射性活度浓度,并用内梅罗综合评价法对其结果进行评价。结果表明:丹东地区0~10 cm土层土壤226 Ra、232 Th、40 K的平均放射性活度浓度分别为100.12 Bq·kg^(-1)、11.84 Bq·kg^(-1)、688.65 Bq·kg^(-1),内梅罗综合指数分别为3.17、0.35、1.07,与辽宁省均值比较,丹东226 Ra含量特高,232 Th微量,40 K偏高,处于全国测定结果范围内。

In order to clarify the background value of soil radioactivity in Dandong area,representative soil in Dandong area was used as research object,and the specific activities of 226 Ra,232 Th and 40 K in 0-10 cm soil layer were measured by RMS 4096-USB digital low background multichannel r spectrometer.Results were evaluated by Nemero comprehensive evaluation method.The results show that the average specific activities of 226 Ra,232 Th and 40 K in 0-10 cm soil layer in Dandong area are 100.12 Bq·kg^(-1),11.84 Bq·kg^(-1) and 688.65 Bq·kg^(-1) respectively.And the Nemero comprehensive index is 3.17,0.35,1.07,which is at a high level in Liaoning province and at a normal level in the whole country.