济南—淄博—泰安地区地表伽玛辐射特征及环境影响评价

Gamma Radiation Characteristics and Environmental Impact Assessment of Surface in Jinan-Zibo-Tai'an Area

摘要:

通过对济南—淄博—泰安地区地表γ辐射和土壤放射性核素测量，深入研究了其放射性特征、分布规律及其影响因素。结果表明，研究区地表γ辐射剂量率平均值为53.94nGy/h，变化范围为7.00~216.00nGy/h；226Ra放射性比活度平均值为23.36Bq/kg，232Th放射性比活度平均值为34.70Bq/kg，40K放射性比活度平均值为539.36Bq/kg，均低于山东省平均值；研究区内土壤样品天然放射性核素放射性比活度分析结果总体水平不高。地质背景决定地面γ辐射剂量率值，同时环境因素对其剂量率也存在一定影响。研究区年有效剂量当量为0.33mSv，低于公众照射年剂量当量限值1.0mSv，人居环境基本不受影响。

Abstract:

Based on the survey of ground gamma radiation and radioactive nuclide in soil in Jinan-Zibo-Tai'an area, its radioactive characteristics, distribution law and influencing factors have been studied. It is showed that average value of ground gamma radiation dose rate is 53.94nGy/h, range scope is 7.00~216.00nGy/h, average value of 226Ra specific activity is 23.36Bq/Kg, average value of 232Th specific activity is 34.70Bq/kg, and average value of 40K activity is 539.36Bq/kg. Specific activity values of natural radionuclides radioactivity of soil samples are generally low. Geological background was the main factor which effected the gamma radiation dose rate of the surface soil, and environmental factors on the dose rate also has certain influence. The annual effective dose in study area is 0.33mSv, which is lower than the public exposure dose limit of 1.0mSv. It is basically not harmful for the living environment.