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Integrated amounts of deposition of Sr-90 and Cs-137 through the end of July 1963 are respectively 45.2 mc/km2 and 125.4 mc/km2 taking the radioactive decay into consideration. From the observation of Sr-90 deposition during the one year period since September 1961, it was concluded that the ratio of fission and fusion energy of the explosion which took place in the fall of 1961 would be 1: 5 and the total release of Sr-90 would be about 2 MC. The residence time of nuclear debris in the stratosphere was newly calculated and the residence time of one year was given as its minimum value. Comparisons were made between the calculated values of Sr-90 from total beta counting data and the observed values by radiochemical analysis. The results showed good agreement during the period from November 1961 to May 1962. The analysis was done with respect to the relation between meteorological conditions and fallout rate and the increase of fallout was observed when the trough at 500mb existed above the observation site. The analytical data of radio-nuclides in rain water collected on 26-27 October 1961 and radio-iodine data in the air of Tokyo from September to December 1961 are listed. 1. Evaluation of 1961 explosions Table 1 and Fig. 1 show the monthly rate of deposition of fallout of Cs-137 and Sr-90 in Tokyo and the integrated amounts since April 1957 through the end of July 1963. Taking the radioactive decay of both nuclides into consideration the total cumulative amounts are calculated to be 125.4 mc/km2 and 45.2 mc/km2 respectively for Cs-137 and Sr-90. As already discussed in detail in the previous paper by the present authors (MIYAKE, SARUHASHI, KATSURAGI and KANAZAWA, 1962) the socalled spring peak was clearly observed every year since 1959. As tests were resumed after a three-year moratorium in the beginning of September 1961, it may be of interest to compare the monthly rate of fallout as well as the total deposition during two particular periods, from November 1958 when the nuclear tests were stopped, to August 1959, and from the beginning of November 1961 to the end of August 1962. In Table 2 are given the total beta activity of fallout (reduced value to that

Deposition of Sr-90 and Cs-137 in Tokyo through the End of July 1963