90Sr and 239+240Pu in the surface air in Japan : Their concentrations and size distributions.
90Sr and 239+240Pu in the surface air in Japan : Their concentrations and size distributions.
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日本地表空气中的 90Sr 和 239 240Pu：它们的浓度和尺寸分布。
DOI：
10.2467/mripapers.37.255
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发表时间：
1986
影响因子：
--
通讯作者：
Y. Katsuragi
中科院分区：
文献类型：
--
作者：
K. Hirose;Y. Sugimura;Y. Katsuragi
1978 ~ 1983年在筑波和东京观测了地面空气中的~（90）Sr和~（239+）Pu浓度。它们表现出显着的季节变化，春季最大，秋季最小。在1981年春季观测到的这些浓度的明显峰值是这一研究期间的最大值，这归因于中国第26次爆炸产生的平流层沉降物。在春季最高峰时，最小颗粒（小于1.6 μm）中的90 Sr和239+ 240 Pu浓度显著增加。在不久的将来，作为平流层沉降物之外的另一个来源，土壤颗粒中的放射性核素的再悬浮将对空气中的239+ 240 Pu而不是90 Sr产生重要影响。
90Sr and 239+240Pu concentrations in the surface air were observed at Tsukuba and Tokyo during the period from 1978 to 1983. They showed remarkable seasonal variation with a spring maximum and a fall minimum. The pronounced peak in these concentrations observed in the spring season of 1981, which was maximum in this period of study, is attributed to the stratospheric fallout derived from the 26th Chinese explosion. Marked increases of the 90Sr and 239+240Pu concentrations were observed in the smallest particles (less than 1.6 μm) at the spring maximum. The resupension of the radionuclide bearing soil particles, as one of the sources besides the stratospheric fallout, will be significant for the airborne 239+240Pu rather than 90Sr in near future.