Mass-Yield Distribution of the Fission Products in Fallout from the 14 May 1965 Nuclear Explosion

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Science  05 Aug 1966:
Vol. 153, Issue 3736, pp. 633-635
DOI: 10.1126/science.153.3736.633


Twenty single particles separated from a 20-liter sample of rain collected in Osaka, Japan, shortly after the 14 May 1965 test explosion of the Chinese nuclear device, were analyzed radiochemically. The abundance pattern of the fission products in these particles resembled the shape of the mass-yield curve for the thermal neutron-induced fission of uranium-235, except for the facts that cesium-hl37 and strontium-90 were markedly depleted and the yields near the symmetric fission region appeared to be somewhat enhanced.