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RE: Naturally occurring Pu-244



In his Nuclear Chemistry textbook, Choppin refers to Pu-244 found in cerium-rich minerals, but doesn't give a specific reference.



Also check out a paper, "Radiometric Chronology of the Early Solar System" by George Wetherill in Annual Review of Nuclear Science, Vol 25, 1975, pp. 283-328.   He has a discussion of Pu-244 on pp. 304-205. There are several references he gives where Pu-244 tracks were detected in various meteorites.



Rick 



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