Laser sampling in isotope studies on uranium minerals

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Authors:Anderson, Ye. B.; Zaslavskiy, V. G.; Nikitin, S. A.; Pavshukov, V. V.; Severin, V. V.; Shishlov, V. A.
Volume Title:Geochemistry International
Source:Geochemistry International, 24(7), p.132-135. Publisher: Springer-Verlag, Heidelberg, International. ISSN: 0016-7029
Publication Date:1987
Note:In English
Summary:Obtaining correct results in dating uranium minerals is largely determined by the purity of the analysed sample, which is related to the heterogeneity of U minerals themselves and their tendency to contain lead-bearing sulphides. The purest samples are obtained with the 'local' method, where they are extracted from U minerals by optically controlled drilling. However, the method is quite laborious and involves difficulties in isolating phases of size <0.3 mm. Also, in mechanical sampling, the drill may wear and material may enter the sample from it, which is a potential source of errors. Here a method is described that substantially extends the possibility of local isotope analysis of U minerals. A focused laser beam is used. The sampling area is determined by the size of the U mineral segregation or of the individual phases and can be adjusted by means of ordinary optical devices from 0.01-0.02 up to 0.3-0.4 mm. The entire sampling procedure for a single point takes a few minutes and maximally eliminates impurities. (Author's abstract) [A.W.H.]
Subjects:Chemical analysis; Errors; Heterogeneity; Impurities; Isotopes; Laser methods; Methods; Sampling; U/Pb; Uranium minerals
Abstract Numbers:88M/4953
Record ID:2014095203
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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