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Science 31 January 1969:
Vol. 163. no. 3866, pp. 465 - 467
DOI: 10.1126/science.163.3866.465
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Articles

Plutonium-238 in Fallout

T. Mamuro 1 and T. Matsunami 1

1 Radiation Center of Osaka Prefecture, Shinkecho 704, Sakai-shi, Osaka, Japan

The observed variation in the activity ratio of plutonium-238 to plutonium-239 plus plutonium-240 in rainwater in Japan over the period from 1961 through 1968 seems to indicate that the influence of the plutonium-238 released by the burnup of the nuclear auxiliary power generator (SNAP-9A) became noticeable within about 6 months and that variation in the isotope ratio with time is affected by nuclear debris produced in the latest explosions as well as by the plutonium-238 released from the SNAP-9A generator.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)