Abstract
An empirical model is presented for estimating the surface deposition of “worldwide” radioactivity from atmospheric nuclear detonations given the yield, latitude, season and type of each burst. The procedure is readily adaptable to computer calculation. The model is based primarily on injection-deposition experience gained from the U.S. and U.S.S.R. nuclear tests in 1958. Use of the technique to estimate 90Sr deposition from the 1961–62 tests shows the predictions are usually within a factor of two of the observed deposition.

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