NDLI: Isotope Ratio Measurements of Uranium by La-hr-icp-ms

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Isotope Ratio Measurements of Uranium by La-hr-icp-ms

Content Provider	Semantic Scholar
Author	Marín, Rafael Calvente Sarkis, Jorge Eduardo Souza
Copyright Year	2011
Abstract	ABSTRACT This work describes the utilization of Laser Ablation High Resolution Inductively Mass Spectrometry (LA-HR-ICP-MS) technique for the determination of uranium isotope composition in a UO 2 pellet (CRM -125A) supplied and certified by the New Brunswick Laboratory (NBL). 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 precision of the measurements were improved by adjusting the following parameters: RF power, laser beam diameter, defocusing of laser beam, laser energy, laser energy-density, auxiliary gas and sample gas. The measurements were performed on a continuous ablation with low energy density and defocusing, which demonstrated to be the optimum to reach the best signal stability. Isotope ratios, 234 U/ 238 U, 235 U/ 238 U and 236 U/ 238 U were measured, reaching relative standard deviations (RSD) from 1.55% to 7.60%. The parameters which caused the greatest impact in order to improve the signal stability were RF power, defocusing and laser beam diameter. 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 testimony that is very important for safeguards and nuclear forensics purposes.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.ipen.br/biblioteca/2011/inac/16941.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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