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Mitsuru Ebihara,Naoki Shirai,Jin Kuwayama,Yosuke Toh 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
Very low contents (in the range of 10 9 g/g) of Ir in mantle-derived rock samples (komatiites) were nondestructively 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 platinumgroup elements. Because the INAA procedure used in this study is non-destructive and is almost freefrom spectral interference in gamma-ray spectrometry, the INAA values of Ir contents obtained in thisstudy 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 presentexperimental conditions, detection limits were estimated to be 1 pg/g, which corresponds to 0.1 pg for asample mass of 0.1 g. These levels can be even lowered by an order of magnitude, if necessary, whichcannot be achieved by ICP-MS carried out in this study.