成都经济区不同类型土壤天然放射性核素含量分布特征  

Distribution Characteristics of Natural Radionuclide Content in Different Type Soil in Chengdu Economic Area

作　　者：刘合凡[1] 葛良全[1] 曾兵[1] 吴和喜[2] 罗耀耀[1] 

机构地区：[1]成都理工大学地学核技术四川省重点实验室,四川成都610059 [2]东华理工大学,江西南昌330013

出　　处：《水土保持通报》2014年第6期267-269,276,共4页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"地球和月球表面诱发伽玛辐射场及其地质响应研究"(41374136)

摘　　要：利用数据分离技术,从已有的1∶25万区域化探数据中提取成都经济区不同类型土壤的238 U,232 Th,40 K含量数据,并在实地取样分析的基础上对该区不同类型土地天然放射性核素含量的分布特征进行了研究。结果表明:(1)该区土壤天然放射性核素含量与世界、全国和四川省处于同一水平;(2)黄壤、棕壤、紫色土、水稻土、灰潮土、草毡土的天然放射性核素含量分别为:238 U:3.18,2.40,2.12,2.45,2.48和2.73,均值30.41(单位为10-6 g/g);232 Th:14.27,14.64,11.67,13.98,13.41和14.09,均值54.35(单位10-6 g/g);40 K:2.06,2.38,1.94,1.74,1.83和2.22,均值1.98(单位为10-2 g/g);(3)不同类型土壤的天然放射性含量大小顺序表现为:238 U:黄壤>草毡土>灰潮土>水稻土>棕壤>紫色土;232 Th:棕壤>黄壤>草毡土>水稻土>灰潮土>紫色土;40 K:棕壤>草毡土>黄壤>紫色土>灰潮土>水稻土;(4)同类型土壤的天然放射性核素含量,平原地区比高山地区低。Using the data separation technology, based on the data extracted from the 1 ： 250 000 available and regional geochemical data of the content of natural radionuclide（238 U, 232Th, 40K） in different type soil in Chengdu Economic Area, field sampling and analysis were carried out. Then, the distrbution characteristics of natural radionuclide content in different type soil were studied in this area. The results showed that： （1） The contents of natural radionuclides in the area soil were at the same level with the world, the whole nation and Sichuan Province. （2） The contents of 238U in yellow soil, brown soil, purple soil, paddy soil,gray soil and grass mat soil were 3.18, 2.40, 2.12, 2.45, 2.48, 2. 73, respectively, the average was 30.41 （the unit was 10-6 g/g）; the contents of Z3ZTh were 14.27, 14.64, 11.67, 13.98, 13.41, 14.09, the average was 54.35（10-6 g/g） ; the contents of 40K were 2.06, 2.38, 1.94, 1.74, 1.83, 2.22, the average was 1.98 （10-2 g/g） ; （3） The contents of natural radionuclides in different type soil showed up the rules as following： the content of 238U in yellow soil〉grass mat soil 〉gray damp soil〉paddy soil〉brown soil〉purple soil; the content of 232Th in brown soil〉yellow soil〉grass mat soil〉paddy soil〉gray damp soil〉purple soil; the content of 40K in brown soil〉grass mat soil〉yellow soil〉purple soil〉gray damp soil〉paddy soil; （4） In the same type soil, the natural radionuclide content of plain soil was lower than that of mountain.

关 键 词：成都经济区 土壤类型 天然放射性核素 

分 类 号：P631.64[天文地球—地质矿产勘探] X124[天文地球—地质学]