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• W2087292211 startingPage "179" @default.
• W2087292211 abstract "The application of scanning electron microscopy (SEM) and secondary ion mass spectrometry (SIMS) for characterization of mixed plutonium and uranium particles from nuclear weapons material is presented. The particles originated from the so-called Thule accident in Greenland in 1968. Morphological properties have been studied by SEM and two groups were identified: a “popcorn” structure and a spongy structure. The same technique, coupled with an energy-dispersive X-ray (EDX) spectrometer, showed a heterogeneous composition of Pu and U in the surface layers of the particles. The SIMS depth profiles revealed a varying isotopic composition indicating a heterogeneous mixture of Pu and U in the original nuclear weapons material itself. The depth distributions agree with synchrotron-radiation-based μ-XRF (X-ray fluorescence microprobe) measurements on the particle (Eriksson, M., Wegryzynek, D., Simon, R., & Chinea-Cano, E., in prep.) when a SIMS relative sensitivity factor for Pu to U of 6 is assumed. Different SIMS identified isotopic ratio groups are presented, and the influence of interferences in the Pu and U mass range are estimated. The study found that the materials are a mixture of highly enriched 235 U ( 235 U: 238 U ratio from 0.96 to 1.4) and so-called weapons grade Pu ( 240 Pu: 239 Pu ratio from 0.028 to 0.059) and confirms earlier work reported in the literature." @default.
• W2087292211 created "2016-06-24" @default.
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• W2087292211 date "2007-05-09" @default.
• W2087292211 modified "2023-10-11" @default.
• W2087292211 title "The Use of SIMS and SEM for the Characterization of Individual Particles with a Matrix Originating from a Nuclear Weapon" @default.
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• W2087292211 doi "https://doi.org/10.1017/s1431927607070353" @default.
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• W2087292211 hasPublicationYear "2007" @default.
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