Synthetic 239Pu/242Pu isotope mixtures as basis for absolute Pu isotopic measurements at CBNM
In view of the characterisation of reference materials for isotopic measurements of plutonium, a series of 20 synthetic isotope mixtures was prepared. Highly enriched 239Pu and 242Pu materials were mixed gravimetrically as Pu oxides in ratios ranging from 0.1 to 1.0. Taking into account the different uncertainty sources, such as isotopic composition and chemical impurities in the starting materials, hygroscopicity, stoichiometry and weighing, the total uncertainty for any of the mixtures is less than 0.02%. The correction factor for isotope fractionation of two neighbouring masses (eg. 239Pu/240Pu) can therefore be determined to +/- 0.01% for all practical purposes. These mixtures are stored in units of approximately 1 mg and will form the basis of "absolute" Pu isotopic measurements at CBNM for the next twenty years.
Bibliographic Reference: Paper presented: 12th ESARDA Symposium, Avignon (FR), May 14-16, 1991
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Record Number: 199110276 / Last updated on: 1994-12-02
Original language: en
Available languages: en