東京における1963年7月末までのSr-90およびCs-137の降下

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書誌事項

タイトル別名
  • Deposition of Sr-90 and Cs-137 in Tokyo through the End of July 1963
  • トウキョウ ニ オケル 1963ネン 7ガツ スエ マデ ノ Sr-90 オヨビ Cs-137 ノ コウカ エイブン
公開日
1963
DOI
  • 10.2467/mripapers1950.14.1_58
公開者
Japan Meteorological Agency

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説明

Integrated amounts of depo sition 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-90deposition 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.<BR>The residence time o f 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.

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