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Improved isotopic SIMS measurements of uranium particles for nuclear safeguard purposes

Ranebo, Ylva LU ; Hedberg, P. M. L.; Whitehouse, M. J.; Ingeneri, K. and Littmann, S. (2009) In Journal of Analytical Atomic Spectrometry 24(3). p.277-287
Abstract
The isotopic analysis of particles containing sub-pg to pg levels of uranium, released from nuclear material handling, has been proven as an efficient tool for international safeguard purposes. Precise and accurate measurement of both enrichment and the minor isotopes is, however, a challenging analytical task due to the low levels of material. One of the mainstay techniques for particle measurement is Secondary Ion Mass Spectrometry (SIMS), this study evaluates the analytical benefit of an alternative in the form of large geometry SIMS (LG-SIMS), which combines high transmission with high mass resolution. We report here that LG-SIMS instruments provide a significantly better measurement quality than the small geometry SIMS as almost all... (More)
The isotopic analysis of particles containing sub-pg to pg levels of uranium, released from nuclear material handling, has been proven as an efficient tool for international safeguard purposes. Precise and accurate measurement of both enrichment and the minor isotopes is, however, a challenging analytical task due to the low levels of material. One of the mainstay techniques for particle measurement is Secondary Ion Mass Spectrometry (SIMS), this study evaluates the analytical benefit of an alternative in the form of large geometry SIMS (LG-SIMS), which combines high transmission with high mass resolution. We report here that LG-SIMS instruments provide a significantly better measurement quality than the small geometry SIMS as almost all isobaric background interferences are removed at a high useful ion yield. Useful yield measurements, performed on uranium oxide particles with calibrated uranium content, showed an overall useful yield of 1.2% for the LG-SIMS at a mass resolution of 3000. These improvements were then demonstrated by comparing results from actual nuclear inspection samples measured on both instruments. Additional benefits include an increased ability to detect particles of interest in a dust matrix while simultaneously reducing the time of sample analysis. An evaluation on the performance of LG-SIMS compared to Thermal Ion Mass Spectrometry (TIMS) is also presented. This evaluation shows that LG-SIMS has an advantage due to its high ion yield but with a limitation in the detection limit of U-236 at higher enrichments due to the necessity for a hydrogen correction. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Analytical Atomic Spectrometry
volume
24
issue
3
pages
277 - 287
publisher
Royal Society of Chemistry
external identifiers
  • wos:000263715200002
  • scopus:61349176011
ISSN
1364-5544
DOI
10.1039/b810474c
language
English
LU publication?
yes
id
b982484e-4925-4959-aba7-a33dd2946808 (old id 1371135)
date added to LUP
2009-05-08 14:35:55
date last changed
2017-12-10 03:39:25
@article{b982484e-4925-4959-aba7-a33dd2946808,
  abstract     = {The isotopic analysis of particles containing sub-pg to pg levels of uranium, released from nuclear material handling, has been proven as an efficient tool for international safeguard purposes. Precise and accurate measurement of both enrichment and the minor isotopes is, however, a challenging analytical task due to the low levels of material. One of the mainstay techniques for particle measurement is Secondary Ion Mass Spectrometry (SIMS), this study evaluates the analytical benefit of an alternative in the form of large geometry SIMS (LG-SIMS), which combines high transmission with high mass resolution. We report here that LG-SIMS instruments provide a significantly better measurement quality than the small geometry SIMS as almost all isobaric background interferences are removed at a high useful ion yield. Useful yield measurements, performed on uranium oxide particles with calibrated uranium content, showed an overall useful yield of 1.2% for the LG-SIMS at a mass resolution of 3000. These improvements were then demonstrated by comparing results from actual nuclear inspection samples measured on both instruments. Additional benefits include an increased ability to detect particles of interest in a dust matrix while simultaneously reducing the time of sample analysis. An evaluation on the performance of LG-SIMS compared to Thermal Ion Mass Spectrometry (TIMS) is also presented. This evaluation shows that LG-SIMS has an advantage due to its high ion yield but with a limitation in the detection limit of U-236 at higher enrichments due to the necessity for a hydrogen correction.},
  author       = {Ranebo, Ylva and Hedberg, P. M. L. and Whitehouse, M. J. and Ingeneri, K. and Littmann, S.},
  issn         = {1364-5544},
  language     = {eng},
  number       = {3},
  pages        = {277--287},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of Analytical Atomic Spectrometry},
  title        = {Improved isotopic SIMS measurements of uranium particles for nuclear safeguard purposes},
  url          = {http://dx.doi.org/10.1039/b810474c},
  volume       = {24},
  year         = {2009},
}