Journal of Radioanalytical and Nuclear Chemistry

, Volume 291, Issue 1, pp 143–145 | Cite as

Measurements of Ir concentration in geological standard samples using neutron activation analysis with multiple gamma-ray coincidence method

  • Yuichi HatsukawaEmail author
  • Takahito Osawa
  • Masumi Oshima
  • Yosuke Toh
  • Atsushi Kimura
  • Mitsuo Koizumi
  • Kazuyoshi Furutaka


In this study, the Ir concentrations in some standard rock samples were determined by using the multiple γ-ray detection method. The use of the multiple γ-ray detection method, which was developed for nuclide quantification, yielded better resolution and sensitivity than the ordinary singles γ-ray detection method. Iridium is one of the least abundant elements in Earth’s crust, with an average mass fraction of 0.001 ppm in a crust rock. However, iridium is relatively more abundant (concentration: 0.5 ppm or more) in undifferentiated meteorites. Therefore iridium abundance anomalies in geological samples provide important information about meteorite impact. The standard rock samples used in this study were SARM-76, FC-1 and FC-2. The SARM-76 was prepared from a platinum ore, and issued by the south African bureau of standards. FC-1 and FC-2 were obtained from fish clay sediment samples from Stevens Klint, Denmark.


Neutron activation analysis Neutron Activation Analysis with Multiple Gamma ray detection (NAAMG) Ir Fish clay SARM-76 Standard material 



Authors are grateful to Dr. R. Gwozdz for providing FC-1 and FC-2 samples. This research was supported by the Grant-in-Aid for Scientific Research C (KAKENHI) 20540478.


  1. 1.
    Oshima M, Toh Y, Hatsukawa Y, Koizumi M, Kimura A, Haraga A, Ebihara M, Sushida K (2008) J Radioanal Nucl Chem 278:257–262CrossRefGoogle Scholar
  2. 2.
    Oshima M, Toh Y, Hayakawa T, Hatsukawa Y, Shinohara N (2002) Nucl Sci Technol 39:292–294CrossRefGoogle Scholar
  3. 3.
    Hatsukawa Y, Oshima M, Hayakawa T, Toh Y, Shinohara N (2002) Nucl Instr Meth A 482:328–333CrossRefGoogle Scholar
  4. 4.
    Toh Y, Oshima M, Hatsukawa Y, Hayakawa T, Shionohawa N (2001) J Radioanal Nucl Chem 250:373–376CrossRefGoogle Scholar
  5. 5.
    Furuno K, Oshima M, Komatsubara T, Furutaka K, Hayakawa T, Kidera M, Hatsukawa Y, Matsuda M, Mitarai S, Shizuma T, Saitoh T, Hashimoto N, Kusakari H, Sugawara M, Morikawa T (1999) Nucl Instr Meth A 421:211–226CrossRefGoogle Scholar
  6. 6.
    Alvarez LW, Alvarez W, Asaro F, Michel HV (1980) Science 208:1095–1108CrossRefGoogle Scholar
  7. 7.
    Kyte FT, Zhou Z, Wasson T (1980) Nature 288:651–656CrossRefGoogle Scholar
  8. 8.
    Jørgensen UG, Applel PWU, Hatsukawa Y, Frei R, Oshima M, Toh Y, Kimura A (2009) Icarus 204:368–380CrossRefGoogle Scholar
  9. 9.
    Hatsukawa Y, Mahmudy Gharaie MH, Matsumoto R, Toh Y, Oshima M, Kimura A, Noguchi T, Goto T, Kakuwa Y (2003) Geochim Cosmochim Acta 67:A138Google Scholar
  10. 10.
    Osawa T, Hatsukawa Y, Nagao K, Koizumi M, Oshima M, Toh Y, Kimura A, Furutaka K (2009) Geochemical J 43:415–422CrossRefGoogle Scholar
  11. 11.
    Gwozdz R, Hansen HJ, Rasmussen KL (2001) Geostand Newsl 25:159–166CrossRefGoogle Scholar
  12. 12.
    Certificate of analysis SARM76 Merensky ore MINTEK republic of south Africa,
  13. 13.
    Schuraytz BC, Lindstrom DJ, Sharpton VL (1997) Large meteorite impacts and planetary evolution:6111.PDFGoogle Scholar
  14. 14.
    Mao X, Hou X, Li C, Ouyang H, Chai Z (2001) Geostand Newsl 25:167–171CrossRefGoogle Scholar
  15. 15.
    Krogh Jensen K, Baker J, Waight T, Frei R, Peate DW (2003) Geostand Geoanalysis 27:59–66CrossRefGoogle Scholar
  16. 16.
    Hatsukawa Y, Toh Y, Oshima M, Hayakawa T, Shinohara N, Kushita K, Ueno T, Toyoda K (2003) J Radio Analyt Nucl Chem 225:111–113CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  • Yuichi Hatsukawa
    • 1
    Email author
  • Takahito Osawa
    • 1
  • Masumi Oshima
    • 1
  • Yosuke Toh
    • 1
  • Atsushi Kimura
    • 1
  • Mitsuo Koizumi
    • 1
  • Kazuyoshi Furutaka
    • 1
  1. 1.Japan Atomic Energy AgencyTokaiJapan

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