Title: Conversion electron spectrometry of Pu isotopes with a silicon drift detector
Citation: APPLIED RADIATION AND ISOTOPES vol. 109 p. 183-188
Publication Year: 2016
JRC N°: JRC95936
ISSN: 0969-8043
URI: http://www.sciencedirect.com/science/article/pii/S0969804315302839
DOI: 10.1016/j.apradiso.2015.11.052
Type: Articles in periodicals and books
Abstract: An electron spectrometry set-up was built at IRMM consisting of a vacuum chamber with a moveable source holder and windowless Peltier-cooled silicon drift detector (SDD). The SDD is well suited for measuring low-energy x rays and electrons emitted from thin radioactive sources with low self-absorption. The attainable energy resolution is better than 0.5 keV for electrons of 30 keV. It has been used to measure the conversion electron spectra of three plutonium isotopes, i.e. 238Pu, 239Pu, 240Pu, as well as 241Am (being a decay product of 241Pu). The obtained mixed x-ray and electron spectra are compared with spectra obtained with a close-geometry set-up using another SDD in STUK and spectra measured with a Si(Li) detector at IRMM. The potential of conversion electron spectrometry for isotopic analysis of mixed plutonium samples is investigated. With respect to the 240Pu/239Pu isotopic ratio, the conversion electron peaks of both isotopes are more clearly separated than their largely overlapping peaks in alpha spectra.
JRC Directorate:Health, Consumers and Reference Materials

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