摘要
文章对比分析研究了江西相山铀矿区和非铀矿区稻谷中天然放射性核素U和Th的含量特征。样品分别采自江西省相山铀矿区及远离铀矿区的抚州市郊丘陵水稻种植区。结果表明相山铀矿区稻谷中天然放射性核素U的含量显著高于非铀矿区的稻谷,铀矿区内稻谷中放射性核素U含量平均值是非铀矿区的5.30倍;但铀矿区内稻谷中放射性核素Th的含量却较非铀矿区稻谷含量低,仅为其Th含量的50%。另外,相山铀矿区内稻谷中放射性核素U和Th之间存在较为显著的线性关系,稻谷中放射性核素Th的含量随U含量的增加而升高。铀矿区内稻谷中放射性核素U含量显著高于非铀矿区的原因还有待于进一步深入研究,然而加强该领域的研究对于保证我国区域稻谷质量和食品安全是非常重要和有意义的。
The contents of natural radioactive nuclides such as uranium and thorium in paddies were analyzed and compared by means of ICP-MS. Totally 14 paddy samples were distinguished into two groups and collected from two rice planting area. One group （12 paddy samples） was collected from the Xiangshan uranium deposit area, Jiangxi province; while the other group （2 samples） collected from non-uranium deposit suburban area of Fuzhou city, Jiangxi, as comparison samples. The distance between the two sampling areas is about 80 kilometers. Before analysis, those paddy samples were continuously carbonized by two hours first, then continuously incinerated for 8 hours at the temperature of 600 degrees centigrade. The results show that the uranium contents in the paddy ash of samples gotten from Xiangshan uranium deposit area range from 0. 053 to 1. 482ug·g^-1. The uranium contents of two comparison paddy samples ash are 0. 059 and 0. 061ug·g^-1, respectiovely. The average uranium content of paddy ash of uranium deposit area is 0. 323ug·g^-1. Compared with the comparison samples, the uranium contents of paddy ash of uranium deposit area are considerably high, 5.30 times that of non-uranium deposit area. The thorium contents in paddy ash of the uranium deposit area, however, are relatively low and less than that of samples collected from non-uranium deposit area, which range from 0. 029 to 0. 311ug·g^-1; The average level is 0. 104ug·g^-1, only about 50% of that of paddy ash sampled from non--urnaium deposit area. Moreover, there is significant linearity correlation between uranium and thorium contents of paddy sampled from Xiangshan uranium deposit area. The positive effects show that the thorium contents of paddy increase as uranium contents of paddy in uranium deposit area increase. The causes for the remarkable difference in uranium contents in paddy between urianium deposit area and non-uranium deposit area are not clear yet. The research on this topic, however, is very important and significant to the regional rice quality and food security.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第7期1972-1975,共4页
Spectroscopy and Spectral Analysis
基金
东华理工大学核资源与环境教育部重点实验室项目
江西省教育厅重点科技项目(GJJ09023)
国家"十一五"支撑计划项目(2006BAD25B02)
中国农业大学科研启动基金项目(2005028)资助
关键词
铀矿区
稻谷
天然放射性核素
食品安全
Paddy
ICP-MA/ICP-AES
Natural radioactive nuclides
Uranium deposit area
Food security
