Stratospheric fallout of strontium-89 and barium-140.


A series of nuclear test explosions which occurred in the fall of 1958 caused a very large increase of Sr(89) and Ba(140) in the stratosphere. The Ba(140)/Sr(89) ratio in the stratosphere, and hence in the troposphere, has decreased steadily since then with a half-life of approximately 17 days. 


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