生态与农村环境学报2015，Vol.31Issue(6)：963-966,4.DOI:10.11934/j.issn.1673-4831.2015.06.025
南方某铀尾矿区周边农田土壤中放射性核素的分布特征
Distribution Characteristics of Radionuclides in Soils Around Tailings Dump Sites of a Uranium Mining Field in South China
摘要
Abstract
Uranium mining and beneficiation produces large amounts of tailings, which have become the main sources of radioactive contamination in the soil surrounding the tailings dump sites, directly or indirectly affecting human health. An investigation was performed of the soils around a uranium tailings dump site of a uranium mining field in South China, to explore distribution characteristics of radionuclides ( 238 U,226 Ra,232 Th and 40 K ) in paddy soil. Results show that the content of 238 U peaked at 40 cm in depth of a soil profile at Sampling Site No. 2, and the highest content of 238 U, 226 Ra, 232 Th and 40 K was found in the topsoil at all the other sampling sites. Moreover, within the 0-100 cm soil layer, the con-tents of radionuclides declined with soil depth gradually and the declining trend was the most obvious in the topsoil layer. The uneven distribution of radionuclides in the soil might be attributed to a variety of factors, such as human disturbance, local precipitation, soil pH, soil particle size, and horizontal distance from the dump site. Comprehensive evaluation of the radionuclides (238U, 226Ra, 232Th and 40K) in the paddy soil around the dump site was performed using the method of Nemerow′s pollution index ( NPI) as against the background values of the radionuclides in the soil of Jiangxi Province, in-dicating that the radioactive contamination in the paddy soil surrounding the uranium tailings dump site is at the hazardous level with NPI reaching 53. 45.关键词
铀尾矿库/稻田/放射性核素/比活度Key words
uranium tailings/paddy field/radionuclides/specific activity分类
资源环境引用本文复制引用
姚高扬,华恩祥,高柏,汪勇,占凌之,蒋经乾..南方某铀尾矿区周边农田土壤中放射性核素的分布特征[J].生态与农村环境学报,2015,31(6):963-966,4.基金项目
国家自然科学基金(41162007 （）
41362011 （）
21407023) （）
江西省自然科学基金(20132BAB203031) （20132BAB203031）
国家自然科学基金青年基金(21407023) （21407023）
