摘要
本文根据新疆伊犁盆地南缘1∶2.5万地面γ能谱测量中的铀、钍、钾含量数据,对新疆伊犁盆地南缘地表介质的天然放射性进行了研究和评价。测量结果显示,该地区地表介质中放射性核素^(238)U、^(232)Th和^(40)K的比活度,分别为6.14~2584.64 Bq/kg、2.86~105.63 Bq/kg、11.58~2190.83 Bq/kg。γ射线空气吸收剂量率均值为75.56 nGy/h,低于全国(81.50 nGy/h)和世界(80.00 nGy/h)的平均值;内、外照射指数和年有效剂量都在国家限量标准控制范围内。研究区局部放射性水平相对偏高,与含铀地层露头受自然动力和人类活动等作用下铀元素扩散有关;由于含铀地层露头规模有限,其对放射性环境的影响具有强度小、范围小、不均匀特征。
According to the content of U,Th and K collected from the 1∶25,000 surface energy spectrum measurement data in southern margin of the Yili Basin,the surface of natural radiation have been studied and evaluated in this paper.The results show that the specific activities of radionuclides ^(238)U,^(232)Th and ^(40)K are in the range of 6.14-951.49 Bq/kg,2.86-105.63 Bq/kg and 11.58-2190.83 Bq/kg respectively.The average of the gamma-ray air absorption dose rate is 75.56 nGy/h,which is lower than that of the whole country(81.50 nGy/h)and the world(80.00 nGy/h).Both internal and external exposure indices and annual effective doses are controlled within the limits set by national standards.As the uranium-bearing outcrops are exposed to natural power and human activities under the uranium diffusion,the local radiation levels are relatively high.However,the uranium-bearing outcrops are limited in size,and their impact on the radioactive environment is in small intensity,small range and uneven.
作者
李秋实
陈晓冬
陈瑞
李炳谦
LI Qiushi;CHEN Xiaodong;CHEN Rui;LI Bingqian(No.216 Geologic Party of CNNC,Urumqi 830011,Xinjiang,China)
出处
《矿产勘查》
2023年第2期223-228,共6页
Mineral Exploration
基金
中国核工业地质局“新疆塔里木盆地乌恰—轮台地区铀矿资源调查评价与勘查”项目(201907)资助。
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
gamma-ray spectrometry survey
rate of gamma-ray air absorption dose
annual effective dose
radiation level
