TY - JOUR
T1 - High sensitivity determination of iridium contents in ultra-basic rocks by INAA with coincidence gamma-ray detection
AU - Ebihara, Mitsuru
AU - Shirai, Naoki
AU - Kuwayama, Jin
AU - Toh, Yosuke
N1 - Funding Information:
This study was partly supported by a Grant-in-Aid (KAKENHI; No. 15340193 to ME) from the Japan Society for the Promotion of Science . Technical supports were provided by Drs. M. Oshima, Y. Hatsukawa and Y. Oura, to whom we are deeply grateful. Komatiite samples were donated by Prof. M. Humayun, to whom we are thankful. The manuscript was greatly improved by careful and through reviews by J. Mizera, G. Sun and an anonymous reviewer, to whom our thanks go. This work was conducted under the Inter-organization Atomic Energy Research Program in an academic collaborative agreement between the JAEA and the University of Tokyo.
Funding Information:
This study was partly supported by a Grant-in-Aid (KAKENHI; No. 15340193 to ME) from the Japan Society for the Promotion of Science. Technical supports were provided by Drs. M. Oshima, Y. Hatsukawa and Y. Oura, to whom we are deeply grateful. Komatiite samples were donated by Prof. M. Humayun, to whom we are thankful. The manuscript was greatly improved by careful and through reviews by J. Mizera, G. Sun and an anonymous reviewer, to whom our thanks go. This work was conducted under the Inter-organization Atomic Energy Research Program in an academic collaborative agreement between the JAEA and the University of Tokyo.
Publisher Copyright:
© 2021 Korean Nuclear Society
PY - 2022/2
Y1 - 2022/2
N2 - 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.
AB - 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.
KW - Coincidence counting
KW - Inductively coupled plasma mass spectrometry (ICP-MS)
KW - Instrumental neutron activation analysis (INAA)
KW - Iridium
KW - Multiple Ge detector System
KW - Ultra-basic rocks
UR - http://www.scopus.com/inward/record.url?scp=85112745528&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85112745528&partnerID=8YFLogxK
U2 - 10.1016/j.net.2021.08.010
DO - 10.1016/j.net.2021.08.010
M3 - Article
AN - SCOPUS:85112745528
SN - 1738-5733
VL - 54
SP - 423
EP - 428
JO - Nuclear Engineering and Technology
JF - Nuclear Engineering and Technology
IS - 2
ER -