成都经济区放射性环境评价分析研究

Appraisal of Radioactive Environment for Chengdu Economic Region

运用区域1/25万土壤化探数据中铀、钍、钾的含量数据,对成都经济区的放射性水平进行了评价。介绍了放射性核素含量分布情况和环境放射性水平,通过成都经济区地质情况和成都经济区放射性环境分布情况,分析了地质条件对成都经济区环境放射性的影响,并初步研究了地质条件影响放射性水平的原因。最后总结了成都经济区地质环境对天然放射性水平分布情况的影响规律:除龙门山褶皱带和峨眉山-瓦山断块少部分地区外,绝大部分地区γ射线内外照射指数都在国家建筑材料放射性核素限量标准控制式的范围内;地质构造、地表出露岩层和地表水对放射性水平有较大的影响。

Based on the concentration of U, Th, and K in soil obtained from 1/250 000 geochemical exploration data, this article has made appraisal of Chengdu Economic Region. This paper introduces radionuclide distribution level and radioactive environmental level. By comparing the situation of geology and the natural radioactive environment distribution situation of Chengdu Economic Region, the authors analyze the relation between geological condition and radioactive environment distribution, and preliminarily stucly the way that radioactive level influenced by geological condition. Finally, the authors summarize the rules of effects caused by geological environment on the natural radioactivity level distribution situation of Chengdu Economic Region. First, the external and internal exposure indexes are both less than the national limit of radionuclides in building materials. Second, the situation of geologic structure, the surface appearing rock layer and the surface water have influence on the radioactive environment appraisal.