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KRUGER, HOSLER, AND MILLER
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COLLECTION DATE, 1963
Fig. 3—Sr/*Sr ratios averaged for storms sampled in several locations in the United States during 1963 and shown in comparison to the
values of Kuroda’ for Arkansas (solid points).
half-life of the ratio indicates a well-mixed atmosphere at the precipitation-generating levels with respect to fission-product age, and the
intercept at 167 for weapon fission yields!® correspondsto an “apparent
detonation date” of Oct. 5, 1962, falling within the latest period of
testing.
The peak concentrations of the four storms discussed in this report were about 10 times greater than those of 1962; thus they were
about 400 times greater than those of 1961,
Several features distinguish Sr deposition in precipitation from
convective activity. The first is the relatively large concentration
changes over short time periods in conjunction with the cell structural
features of the clouds, suchas maximum reflectivity values and altitude,
presence of high- and/or low-level precipitation, cell boundaries, etc.
Another is the proportional dependence of the Sr concentration upon
rainfall intensity. This is the reverse of the “Sr dependence observed
in large-scale uplift systems, where the concentration generally is
inversely proportional to the rainfall intensity when the ceiling remains