Stratospheric Fallout of Strontium-89 and Barium-140

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Science  26 Jun 1959:
Vol. 129, Issue 3365, pp. 1742-1743
DOI: 10.1126/science.129.3365.1742


A series of nuclear test explosions which occurred in the fall of 1958 caused a very large increase of Sr89 and Ba140 in the stratosphere. The Ba140/Sr89 ratio in the stratosphere, and hence in the troposphere, has decreased steadily since then with a half-life of approximately 17 days.