【摘要】 了解放射性核素在小颗粒土壤中的分布,对污染土壤再悬浮评估、人员辐射防护和放射性核素迁移研究有重要价值。依据Stokes沉降法则,利用自制沉降筒对某放射性污染区土壤粒径<50μm的颗粒进行分级,并采用HPGeγ谱仪分析各粒级核素241Am含量。结果表明,使用各粒级土壤的密度及1.25倍理论沉降时间分级时,得到各粒级土壤的粒级纯度大于50%,某放射性污染区易悬浮土壤颗粒的质量份额<6%,放射性核素241Am的含量<0.2%。更多还原

【Abstract】 The distribution of radioisotopes in soil of small particle size is very important for the evaluations of the resuspension and personal radiation protection,as well as the research of nuclides migration. According to Stokes sedimentation law,the soil of a particle size less than 50 μm,from a radioactive pollution area,was classified in a barrel which was specifically designed.241Am of the classified samples were detected by HPGe γ spectrometer. The results showed that the quality purity of different granular size was larger than 50% by using optimized density of soil and 1. 25 times’ the theoretical sedimentation time. For the suspensible fine grain from the radioactive pollution area,the fraction of the quality and241Am was less than 6% and 2% respectively.更多还原