放射性核素60Co在土壤中的淋溶和迁移分布

采用模拟土柱法及同位素示踪技术研究了60Co在2种淹水土壤(小粉土、黄红壤)中的淋溶和垂直迁移.结果表明,淋溶后收集到的全部淋溶水中60Co的含量较少,小粉土及黄红壤淋溶水中60Co分别为总活度的5.61%和5.25%;滞留于土壤中的60Co绝大部分分布在土壤表层0~1.0cm范围内,小粉土及黄红壤中分别有69.74%~78.63%和75.77%~86.84%的60Co 滞留于0~1.0cm土层范围内;土壤中60Co 比活度与距土壤表层深度分布呈单项指数规律.

Leaching and vertical transference of radioactive nuclide cobalt-60 in soils

Leaching characteristics and vertical transference of radioactive nuclide cobalt-60 in two representational soils (paddy soil, yellow-red soil) were studied by using isotope-tracer techniques for soil columns simulation installation. The results showed that the specific activity of cobalt-60 in collected leaching water was low after passing through soil column. The amount of cobalt-60 in leaching water of paddy soil and yellow-red earth was 5.61%, and 5.25%. In paddy soil and yellow-red earth, 69.74%~78.63% and 75.77%~86.84% radioactivity of cobalt-60 was concentrated in the 0~1.0 cm upper layer soils respectively, which illustrated that most of cobalt-60 remained in the surface soils. The specific activity of cobalt-60 in soil present was an individual exponential declining with depth of soil.