运用1∶25万化探数据进行区域天然放射性填图评价  

Regional Evaluation and Mapping of Natural Radioactivity With 1∶250000 Geochemical Data

作　　者：李金凤[1] 刘合凡[2] 徐健[1] 齐宁[1] 吴儒杰[1] 

机构地区：[1]核工业北京地质研究院,北京100029 [2]成都理工大学地学核技术四川省重点实验室,四川成都610059

出　　处：《铀矿地质》2016年第2期110-116,共7页Uranium Geology

基　　金：国家自然科学基金项目(41074093);地学核技术四川省重点实验室开放基金资助项目(gnzds2014002)

摘　　要：以1∶25万化探数据为切入点,在分析全国各城市天然放射性水平特征的基础上,运用放射性填图评价技术研究了成都平原天然放射性水平分布特征。结果表明:研究区环境天然放射性核素238 U、232 Th、40 K含量频数均呈正态分布,数值均在正常本底范围内;238 U比活度总体上低于全国平均水平,232 Th和40 K比活度总体上高于全国平均水平;研究区天然放射性辐射水平、γ射线照射量率、吸收剂量率、年有效剂量当量均低于世界和全国的平均水平;研究区γ射线内、外照射指数均在国家限量标准控制范围之内。1 ： 250000 geochemical data was used to analyze the characteristics of natural radioactivity levels in different cities across China and evaluate the distribution of natural radioactivity in Chengdu Plain with the techniques of radioactive mapping. The results shew that the frequency of ^238U, ^232 Th,40 K＇s content is with normal distribution and the content was within the normal range of the background. Compared to the national average values, the radionuclide specific activity of ^238U are lower, and ^40K, ^232Th are higher in Chengdu plain. The natural radioactive radiation, the T-ray exposure rate, the γ radiation absorbed dose rate and the annual effective dose are lower than the national and world average values; and the T-ray irradiation index and external exposure index are within the national control limit.

关 键 词：成都平原 数据分析 填图技术 天然放射性 

分 类 号：P631.64[天文地球—地质矿产勘探]