Uranium isotope ratio measurements by LA-HR-ICP-MS
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2017
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60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS
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This work describes the utilization of LA-HR-ICP-MS (laser ablation high resolution
inductively mass spectrometry) for characterize the uranium isotope ratio of a
UO2 pellet supplied and certified by New Brunswick Laboratory (NBL). This method
is useful measurements of 233U, 234U, 235U, 236U and 238U, reaching relative standard
deviations (RSD) from 1.55% to 2.45%. The Laser ablation ICP-MS technique
shows a high level of instability, compromising the precision of the measurements,
although could be made some adjustments to improve its stability. To reach the better
stability were made the adjustments of laser ablation and ICP-MS parameters,
such as RF power, laser beam diameter, defocusing of laser beam, auxiliary gas and
sample gas. The parameters which caused the greatest impact in order to improve
the stability signal were RF power, defocusing and laser beam diameter. To carry
out the adjustments of the parameters was used a glass standard NIST 610, supplied
and certified by National Institute of Standards and Technology (NIST). The
measurements were carried out on a single spot ablation with low energy density
and defocusing, which demonstrated to be the improved way to reach good signal stability. The results presented by the measurements revealed that the Laser ablation
ICP-MS technique offers a rapid and accurate way to perform uranium isotope
ratios without any sample preparation, since it allows carrying out the measurements
straight on the sample, besides to preserve the sample that is very important to
safeguards and nuclear forensics.
Como referenciar
SARKIS, J.E.S.; MARIN, R.C. Uranium isotope ratio measurements by LA-HR-ICP-MS. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 71-72. Disponível em: http://repositorio.ipen.br/handle/123456789/28772. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.