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首页> 外文期刊>Journal of Environmental Sciences >Dating sediments on several lakes inferred form radionuclide profiles
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Dating sediments on several lakes inferred form radionuclide profiles

机译:根据放射性核素剖面推断出几个湖泊的年代沉积物

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In this paper, several sediment cores from three lades(Gucheng Lake, Dianchi Lake and Dabusopao Lake) in the different regions of China were dated rediometrically by ~210Pb, ~137Cs and in Dianchi also by~241 AM. The study shows that the profiles of ~137Cs in lake sediment of China generally have 2-4 distinct chronological markers, i.e. the onset of fallout in 1954 and peak fallout in 1963, 1974 and 1986. As many places of the northern hemisphere, the peak fallout in 1963 was the result of the atmospheric atomic weapons test. But in some areas of China, there may be have one or two other peaks of ~137Cs fallout, one can derive from Chernobyl fallout in 1986 and the other is caused by the nuclear testing fallout in early 1970s.
机译:本文对中国不同地区的三个梯级(古城湖,滇池和达布索波湖)的几个沉积物岩心进行了重测,测得的年代分别为〜210Pb,〜137Cs和滇池的〜241AM。研究表明,〜137Cs在中国湖泊沉积物中的分布总体上具有2-4个不同的时间标志,即1954年开始降尘,1963、1974和1986年达到峰值。在北半球许多地方, 1963年的辐射是大气原子武器测试的结果。但是在中国的某些地区,可能还会有一个或两个约137Cs的峰值,一个可能是1986年的切尔诺贝利事故所致,另一个是1970年代初的核试验造成的。

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