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原子弹爆炸产生的放射性同位素~(137)Cs降落到地表后,被表层土壤的胶体颗粒牢固地吸附,很难被植物摄取或淋溶掉。~(137)Cs以后的任何运动,均为结合土壤颗粒的物理运动。1956～1965年是核尘埃的主要产出期,其中以1963～1964年浓度最大,1970年以后产出的核尘埃的量极微。~(137)Cs的半衰期为30年。~(137)Cs法是研究土壤侵蚀、泥沙来源的一种新方法。国内外的研究表明,此方法具有快速、可靠、经济的特点。
The radioisotope 137 Cs produced by the atomic bomb explosion landed on the earth’s surface and was firmly adsorbed by the colloidal particles in the surface soil and was hardly absorbed or leached by plants. Any movement after ~ (137) Cs is physical movement combined with soil particles. 1956 ~ 1965 is the main output of nuclear dust, of which the highest concentration in 1963 to 1964, the output of nuclear dust after 1970 the amount of minimal. The half-life of ~ (137) Cs is 30 years. The ~ (137) Cs method is a new method to study the source of soil erosion and sediment. Studies at home and abroad show that this method is fast, reliable and economical.