PRECISE ANALYSIS OF 234U/238U RATIO USING UO2+ ION WITH THERMAL IONIZATION MASS SPECTROMETRY FOR NATURAL SAMPLES
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dc.contributor.author | Yokoyama T. | |
dc.contributor.author | Makishima A. | |
dc.contributor.author | Nakamura E. | |
dc.date.accessioned | 2021-03-13T07:01:08Z | |
dc.date.available | 2021-03-13T07:01:08Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=793153 | |
dc.identifier.citation | Chemical Geology, 2001, 181, 1-4, 1-12 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/26671 | |
dc.description.abstract | We have developed a new, highly precise method for U isotopic analysis using a thermal ionization mass spectrometry (TIMS) by measuring UO2+ ions emitted from a very small amount (100-10 ng) of U. A new ionization activator, a silicic acid-diluted phosphoric acid solution, was found to be effective not only for producing a strong and stable UO2+ ion beam, but also for keeping the mass fractionation during measurement small and constant. U isotope analysis was carried out by a ''dynamic multi collection'' method using three Faraday cup collectors and a secondary electron multiplier in ion counting mode with RPQ (RPQ-SEM). For precise isotope analysis, baselines of the Faraday cups and a conversion factor between Faraday cups and the RPQ-SEM were precisely determined simultaneously with U isotope collection. Analytical precision and reproducibility of 234U/238U ratio ranged from 0.10% to 0.38% (2σmean) and from 0.13% to 0.31% (2σ), respectively, for 100-10 ng of U extracted from a natural rhyolitic obsidian. The precision and reproducibility were improved compared with previous studies, and thus, our method is especially useful for samples with very low abundance of U. | |
dc.subject | PRECISE ANALYSIS | |
dc.subject | 234U/238U RATIO | |
dc.subject | THERMAL IONIZATION MASS SPECTROMETRY | |
dc.title | PRECISE ANALYSIS OF 234U/238U RATIO USING UO2+ ION WITH THERMAL IONIZATION MASS SPECTROMETRY FOR NATURAL SAMPLES | |
dc.type | Статья |
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