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Monthly deposition of 137Cs in the period from 1964 through 1971 at Osaka, Japan.

Monthly deposition of 137Cs at Osaka was measured in the period of 7 years from July 1964 through July 1971. Gamma-ray spectra of the samples collected monthly by the basin method were measured with a large volume Ge(Li) detector shielded with 20 cm iron in order to determine their 137Cs activities. On close examination of the variation of monthly 137Cs deposition, it is noted that, besides the seasonal variation of so-called “spring maximum”, there appeared many peaks, each of which can be assumed to have been caused by the influence of a nuclear explosion. Yearly 137Cs depositions during the period were also estimated and compared with those measured by another institute.