Determination of Uranium in Seventeen CRPG Rock Reference Samples by Independent Nuclear Methods

Some trace‐element contents of U.S. Geological Survey (USGS) samples, biotite Btt‐1 and hornblende Hbl‐1, were determined by both computerized semi‐quantitative spectrographic analysis and instrumental neutron activation analysis. An equal number of portions of the Centre de Recherches Pétrographiques et Géochimiques (CRPG) samples, biotite Mica‐Fe and phlogopite Mica‐Mg, were randomized with portions of the USGS samples and analyzed simultaneously to allow direct comparisons of trace elements in the biotites. Mica‐Fe has concentrations of Cs, Hf, Ta and Zn that are greater by factors of 3 or more than those in Btt‐ 1. Although the Co contents of the two biotites are nearly equal, the amounts of Cr, Sc, La and the rare earth elements are significantly greater in Btt‐1. Mica‐Mg contains larger amounts of Cs and Rb than does Hbl‐1, whereas the Cr content of Hbl‐1 is 15 times that of Mica‐Mg. Btt‐1 and Hbl‐1 may be useful as comparison samples for the analysis of biotites and hornblendes after other data are available.

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Determination of Uranium in Seventeen CRPG Rock Reference Samples by Independent Nuclear Methods

Abstract: Instrumental epithermal neutron activation analysis and delayed neutron assay have both been used to measure uranium in CRPG reference samples. Excellent agreement between the methods was achieved. Results are compared with data from other laboratories.

Cited by 2 publications

References 16 publications

Determination of Uranium in GSJ, CRPG, and CCRMP Reference Samples by Delayed Neutron Assay

Determination of Uranium in GSJ, CRPG, and CCRMP Reference Samples by Delayed Neutron Assay

Some Trace‐Element Contents of Biotite, Btt‐1, and Hornblende, Hbl‐I, by Semiquantitative Spectrographic Analysis and by Instrumental Neutron Activation Analysis

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