KURODA P K, NIX J
Science. 1962 Sep 21;137(3534):991-2. doi: 10.1126/science.137.3534.991.
A steady increase in the strontium-90 concentration in rain was observed at Fayetteville, Arkansas, after the 1961 Soviet nuclear test series. Experimental data indicate that the nuclear weapons tested in 1961 were "cleaner" on the average by a factor of five than those exploded in 1957 and 1958.
1961年苏联进行一系列核试验后，在阿肯色州费耶特维尔观测到雨水中锶-90浓度稳步上升。实验数据表明，1961年测试的核武器平均而言比1957年和1958年爆炸的核武器“更清洁”五倍。
