235U/238U Isotope Ratios in Monthly Atmospheric Deposits Collected at Akita, Japan in 1977 and 1978

AbstractThe 235U/238U ratios in the monthly atmospheric deposition samples in Akita, located at west side of northern part of the main island of Japan, in 1977 and 1978 were determined. The anomalous uranium slightly depleted in 235U has been found in the some deposition samples collected in mid-1977. The uranium depleted in 235U had probably been injected into the atmosphere with plutonium by the largest Chinese nuclear tests conducted on 17th November, 1976 and transported directly throughout the atmosphere