通过精确测定土壤中240Pu/239Pu比值估算长崎西山地区核弹钚的分布情况。
Distribution of nuclear bomb Pu in Nishiyama area, Nagasaki, estimated by accurate and precise determination of 240Pu/239Pu ratio in soils.
作者信息
Yoshida S, Muramatsu Y, Yamazaki S, Ban-Nai T
机构信息
National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba-shi 263-8555, Japan.
出版信息
J Environ Radioact. 2007;96(1-3):85-93. doi: 10.1016/j.jenvrad.2007.01.019. Epub 2007 Apr 8.
Plutonium isotopes in forest soils collected in Nishiyama area, Nagasaki, were successfully determined by high resolution inductively coupled plasma mass spectrometry after the treatment with a microwave decomposition system. The (240)Pu/(239)Pu atom ratios observed in the samples in the Nishiyama area were obviously lower than the range of the global fallout. The low ratios (minimum 0.032) observed in Nishiyama area indicated the influence of detonation of the Pu nuclear weapon in 1945. Since the area is contaminated also by global fallout, the (240)Pu/(239)Pu atom ratio can be more sensitive indicator of bomb-derived Pu than Pu activity concentration.
在用微波消解系统处理后，通过高分辨率电感耦合等离子体质谱法成功测定了长崎西山地区采集的森林土壤中的钚同位素。西山地区样品中观测到的（240）Pu/（239）Pu原子比明显低于全球沉降物的范围。在西山地区观测到的低比值（最低为0.032）表明受到了1945年钚核武器爆炸的影响。由于该地区也受到全球沉降物的污染，与钚活度浓度相比，（240）Pu/（239）Pu原子比可能是源自核弹的钚的更敏感指标。
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