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A comparative evaluation of  238 Pu determination in NIST-SRM-947-Pu isotopic reference material by alpha spectrometry and thermal ionization mass spectrometry (TIMS) is presented. Electrodeposited sources with geometric progression (G.P.) method to account for tail contribution were used in alpha spectrometry. In TIMS, the recently developed approach of using  235 U as a monitor isotope in interfering element correction methodology was employed to account for the isobaric interference of  238 U at  238 Pu. The atom % abundance of  238 Pu determined by both the methods is in good agreement with each other but is higher than that quoted by NIST in the reference material SRM-947-Pu.

A comparative evaluation of 238 Pu determination in NIST-SRM-947-Pu by alpha spectrometry and thermal ionization mass spectrometry