Abstract
Radionuciide concentrations for 89Sr, 90Sr, 144Ce, and 137Cs were sequentially sampled from two rainstorms to study fallout behavior as a function of rainfall rate and type of storm approximately 7 months after the eighth Chinese nuclear explosion of December 27, 1968. Great time variability in the 89Sr/90Sr ratio was found in conjunction with a well-developed storm on July 21, but a nearly steady ratio was observed in a stratified stable-type storm on August 14. Tapping of stratospheric air appeared to be the cause of the ratio changes. For both storms, a strong trend was found for concentrations of radioisotopes to decrease with increase in rainfall rate. Detailed discussions on meteorological factors, including a dilution effect, are given to interpret the experimental data.
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