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An attempt is made to prepare and characterize the working standards of  238 Pu by mixing solutions of enriched isotopes of  238 Pu and  239 Pu, available indigenously. The working standards were characterized using the recently developed interfering element correction methodology in thermal ionization mass spectrometry (TIMS) and the data were compared with those obtained by conventionally used alpha spectrometry. The results obtained by alpha spectrometry on various synthetic mixtures agreed within 0.5 to 1% to those determined by TIMS. These studies show that by mixing accurately weighable amounts of highly enriched  238 Pu and  239 Pu isotopes, it is possible to prepare and characterize the certified reference materials (CRMs) for  238 Pu, which have eluded the nuclear community until recently. The commercial availability of these CRMs would allow the traceability of  238 Pu measurements in Pu using different radio-analytical techniques, provide a common platform to the measurements made on  238 Pu by various nuclear material accounting laboratories around the world, and would also permit the use of newly developed TIMS methodology, by various laboratories, with confidence.

Preparation and characterization of working standards for 238 Pu