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http://dx.doi.org/10.1016/j.net.2021.08.010

High sensitivity determination of iridium contents in ultra-basic rocks by INAA with coincidence gamma-ray detection  

Ebihara, Mitsuru (Department of Earth Sciences, Waseda University)
Shirai, Naoki (Department of Chemistry, Tokyo Metropolitan University)
Kuwayama, Jin (Department of Chemistry, Tokyo Metropolitan University)
Toh, Yosuke (Nuclear Science and Engineering Center, Japan Atomic Energy Agency)
Publication Information
Nuclear Engineering and Technology / v.54, no.2, 2022 , pp. 423-428 More about this Journal
Abstract
Very low contents (in the range of 10-9 g/g) of Ir in mantle-derived rock samples (komatiites) were non-destructively determined by INAA coupled with coincidence gamma-ray spectrometry using 16 Ge detectors. Aliquots of the same samples were analyzed by NiS fire-assay ICP-MS for Ir and other platinum group elements. Because the INAA procedure used in this study is non-destructive and is almost free from spectral interference in gamma-ray spectrometry, the INAA values of Ir contents obtained in this study can be highly reliable. Iridium values obtained by ICP-MS were consistent with the INAA values, implying that the ICP-MS values of Ir obtained in this study are equally reliable. Under the present experimental conditions, detection limits were estimated to be 1 pg/g, which corresponds to 0.1 pg for a sample mass of 0.1 g. These levels can be even lowered by an order of magnitude, if necessary, which cannot be achieved by ICP-MS carried out in this study.
Keywords
Instrumental neutron activation analysis (INAA); Iridium; Ultra-basic rocks; Multiple Ge detector System; Coincidence counting; Inductively coupled plasma mass; spectrometry (ICP-MS);
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