福岡市及びその周辺における核崩壊物降下塵による農産物の汚染について

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  • Rudioactivities of agricultural products polluted by nuclear fall-outs in Fukuoka district
  • フクオカシ オヨビ ソノ シュウヘン ニ オケル カク ホウカイブツ コウカ ジン ニ ヨル ノウサンブツ ノ オセン ニ ツイテ

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Gross counts of the radioactive substances contained in vegetable, milk, and fall-out of fission products deposited on leaf-vegitable were measured periodically since the unclear explosion performed in U.S.S.R. in November, 1961.<br>The results obtained were as follows.<br>1) In removing the radioactive substances deposited on the leaves. A remarkable difference in effect of rinsing was observed between these two results obtained by using only water, and by detergent, particularlly soaplees-soap.<br>The removal rate of the former was about 60% of that of the latter.<br>2) Seasonal variation of the gross counts of radioactive substances contained in the vegetables was almost same as that of deposits on the leaves of the vegetables.<br>As vegetables grew their radioactivity value gradually increased.<br>3) In the case of cow milk, no remarkable difference of the radioactivity value was observed when raw milk and pasteurized milk were examined.<br>4) The 95Zr-95Nb, 103Ru and 40K were found in all of the materials by a method of nuclear analysis of radioactive substances.

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