Cizdziel J V, Hodge V F, Faller S H
Environmental Science and Health Graduate Program, University of Nevada, Reno 89557-0187, USA.
Chemosphere. 1998 Sep;37(6):1157-68. doi: 10.1016/s0045-6535(98)00107-6.
Attic dust and soil samples were collected during the Summer of 1996 and the Spring of 1997 in southern Nevada and southern Utah. Analysis of the samples for radiocesium and plutonium give activity ratios of radiocesium/plutonium that range from 0.7 +/- 0.1 to 27 +/- 2, well below the world-wide fallout ratio of 34 +/- 4 (as of 1 July 1997). This indicates anomalous plutonium throughout the region, including areas to the south of the Nevada Test Site (NTS), generally believed to have received only world-wide fallout. Safety tests and above-ground detonations that resulted in incomplete fission, conducted at the NTS during the 1950's and 1960's, are likely sources of this excess plutonium.
1996年夏季和1997年春季，在内华达州南部和犹他州南部采集了阁楼灰尘和土壤样本。对样本进行的放射性铯和钚分析得出，放射性铯与钚的活度比在0.7±0.1至27±2之间，远低于截至1997年7月1日的全球沉降比34±4。这表明该地区存在异常钚，包括内华达试验场（NTS）以南通常被认为仅受到全球沉降影响的区域。20世纪50年代和60年代在NTS进行的安全测试和导致不完全裂变的地面引爆很可能是这种过量钚的来源。
