新疆伊犁盆地北缘煤炭重点开发区天然放射性水平评价  

Evaluation of Natural Radioactivity Level in the Northern Margin of Yili Basin

作　　者：魏周政 杨镜明[1] 陈晓冬[1] 李秋实[1] 

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《东华理工大学学报（自然科学版）》2017年第3期275-278,共4页Journal of East China University of Technology(Natural Science)

基　　金：中央返回两权价款资金项目(S15-2-LQ01)

摘　　要：利用γ能谱仪对新疆伊犁盆地北缘600 km^2面积土壤的天然放射性核素进行了现场测量,计算γ射线空气吸收剂量率和年有效剂量,研究结果显示,该地区土壤中放射性核素^(238)U,^(232)Th和^(40)K比活度分别为11.12~462.26 Bq/kg,8.08~100.53 Bq/kg,62.6~1774.71 Bq/kg;γ射线空气吸收剂量率为16.06~241.59 nGy/h,均值为74.18 nGy/h,低于全国(81.50 nGy/h)和世界(80.00 nGy/h)的均值;γ外照射年有效剂量在国家标准限量控制的范围内。调查区^(238)U,^(232)Th,^(40)K比活度与局部煤层及其顶板铀矿化出露关系比较密切,但煤层及其顶板(如泥岩)铀矿化厚度和产出规模有限,其对放射性环境的影响具有范围小、不均匀特征。The natural radionuclides of the soil in the northern margin of the Yili basin in Xinjiang were measured by the ground gamma spectrometer. The gamma-ray air absorption dose rate and the effective dose were calculated. The results showed that the specific activities of radionuclides 238U, 232Th and 40K in the soil were 11.12 462.26 Bq/kg,8.08 - 100.53 Bq/kg,62.6- 1 774.71 Bq/kg. The average of the γ-ray air absorption dose rate was 74.18 nGy / h, which was lower than that of the whole country （81.50 nGy/h） and the world （80.00 nGy / h）. As the uranium-bearing outcrops were exposed to natural power and human activities under the uranium diffusion, the local radioactive levels were relatively high. However, the uranium-bearing outcrops were limited in size, and their impact on the radioactive environment is small in size and uneven.

关 键 词：Γ能谱测量 γ射线空气吸收剂量率 年有效剂量 放射性水平 

分 类 号：X837[环境科学与工程—环境工程]