黄土高原中部全新世沉积物辐射剂量率研究  

A Study on the Dose-Rate of Holocene Sediment in the Middle Part of the Loess Tableland

作　　者：米小建[1] 黄春长[2] 周亚利[2] 

机构地区：[1]湛江师范学院物理科学与技术学院,中国湛江524048 [2]陕西师范大学旅游与环境学院,中国西安710062

出　　处：《湖南师范大学自然科学学报》2012年第4期86-90,共5页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(40771018);中央高校基本科研业务费专项基金资助(GK200902020)

摘　　要：通过野外考察,在黄土高原中部采得20个沉积层剖面样品.使用中子活化法测得样品放射性元素U、Th、K质量分数,计算得出样品所在环境的辐射剂量率,发现在黄土土壤剖面中,古土壤层中辐射剂量率大于黄土层;古洪水滞流沉积剖面中的辐射剂量率最大.沉积物剖面中辐射剂量率变化与沉积时期气候环境和沉积物粒度相关.Twenty Holocene sediment samples were collected from the middle part of the loess tableland. The mass concentrations of the radioactive elements U, Th, K were determined by neutron activation analysis （NAA）. And the natural dose-rate was calculated. The analytical results indicated that dose-rate was influenced by the grain-size composition of sediment and climate change. The natural dose-rate is maximum in the layers of paleoflood slack water deposit, and the loess layers is minimum, the soil layer is in the middle.

关 键 词：黄土高原 全新世 辐射剂量率 

分 类 号：P941.74[天文地球—自然地理学]