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原子弹爆炸产生的核尘埃~(137)Cs降落到地表后,被表层土壤的胶休颗粒强烈吸附,很难向下淋溶和被植物摄取。~(137)Cs的半衰期为30年,是研究土壤侵蚀,泥砂输移、堆积的一种很好的示踪源。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。 笔者于1987年6月在山西离石县羊道沟开展了黄土高原小流域泥砂来源的~(137)Cs法研究。本文是该研究的初步结果。
The nuclear dust 137 Cs generated by the atomic bomb explosion landed on the surface of the earth and was strongly adsorbed by the gel particles in the surface soil, making it difficult to leach downward and be ingested by plants. The ~ (137) Cs has a half-life of 30 years and is a good source for studying soil erosion, sediment transport and accumulation. 1956-1965 is the main output period of nuclear dust, of which the highest concentration in 1963-1964, the output of nuclear dust after 1970 is extremely small. In June 1987, the author conducted a study on the source of sediment in the Loess Plateau by means of (137) Cs method in Shepanggou, Lishi County, Shanxi Province. This article is the preliminary result of this study.