Abstract
The IsoTrace heavy element AMS system has been successfully used to detect naturally-occurring 236U ( 236U/ 238U = (5.6 ± 1.5) × 10 −10) in samples of uranium ore from Cigar Lake, Saskatchewan, Canada. This level of 236U agrees with that previously claimed for samples of a processed uranium ore (D.J. Rokop, D.N. Metta and C.M. Stevens, Int. J. Mass Spectrom. Ion Phys. 8 (1972) 259 [1]), and is consistent with the amount of 239Pu found in pitchblende (W.A. Myers and M. Lindner, J. Inorg. Nucl. Chem. 33 (1971) 3233 [2]). This experiment illustrates the general capability of a small tandem-based AMS system for analyzing actinides, in particular 236U. It can be shown that the isotope-ratio detection limit of this system, is at present 5 × 1o −8 for detecting a less abundant actinide isotope one mass unit above, and 5 × 10 −10 one mass unit below, a major isotope.
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