Transuranic depositional history in South Greenland firn layers
Transuranic depositional history in South Greenland firn layers
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南格陵兰冷杉层的超铀沉积历史
作者：
M. Koide;E. Goldberg;M. Herron;C. Langway
格陵兰冰盖的表层保存了过去30年来武器试验产生的超铀核素在大气中沉降的连续而详细的记录。用~（210）Pb年代学方法确定了冰川地层的年龄。我们发现，再活化的土壤碎片与其吸附的超铀元素的影响似乎并不重要，和落尘最大值发生在20世纪50年代和60年代为239 + 240钚和1965-66年为238钚。可以利用中纬度地区的高山冰川来重建过去三十年来的沉降模式，并评价这些核素由于大气沉降和通过核燃料循环的其他可能进入而在当今的扩散情况，从而扩大这项工作。
THE surface layers of the Greenland ice sheet have preserved a continuous and detailed record of atmospheric fallout of transuranic nuclides from weapons tests over the past 30 yr. The ages of the glacial strata were determined by210Pb geochronologies. We found that the influence of remobilised soil debris with their sorbed transuranics does not seem to be important, and that fallout maxima occurred in the 1950s and 1960s for239 + 240Pu and in 1965–66 for238Pu. This work may be extended by using alpine glaciers in mid-latitudes for a reconstruction of fallout patterns over the past three decades and for an evaluation of present day dispersions of these nuclides as a consequence of atmospheric fallout and other possible entries through the nuclear fuel cycle.