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Measurements of iridium concentration in geological standard samples using neutron activation analysis with $$gamma$$-$$gamma$$ coincidence method

多重$$gamma$$線放射化分析法を用いた地球科学的試料中のイリジウム分析

初川 雄一; 大澤 崇人  ; 大島 真澄; 藤 暢輔   ; 木村 敦   ; 小泉 光生 ; 古高 和禎  

Hatsukawa, Yuichi; Osawa, Takahito; Oshima, Masumi; Toh, Yosuke; Kimura, Atsushi; Koizumi, Mitsuo; Furutaka, Kazuyoshi

$$gamma$$線の同時測定と中性子放射化分析法を組合せることにより新しい元素分析法である多重$$gamma$$線放射化分析法(NAAMG)を用いて地球科学試料中のイリジウムの高感度分析を行った。イリジウムは隕石中に豊富に含まれており、隕石衝突の重要な手がかりになる。NAAMG法では10pptのイリジウムの定量が可能だが、この方法を用いて標準岩石試料中のイリジウムの定量分析を行った。

In this paper, iridium concentrations of some of standard rock samples were determined by the multiple $$gamma$$-ray detection method. The multiple $$gamma$$-ray detection method developed for nuclide quantification has achieved better resolution and sensitivity than the ordinary singles $$gamma$$-ray detection method. The INAA combined with this method is called NAAMG (Neutron Activation Analysis with Multiple $$gamma$$ ray detection) which has been successfully applied to various fields. In geological rock samples, the detection limit of iridium can be reached at 10 ppt (10 $$times$$ 10$$^{-12}$$ g/g) with no chemical separations. Iridium is relatively common in meteorites, with concentrations of 0.5 ppm or more. Therefore iridium abundance anormaly provide important information about meteorite impact. The iridium concentration in the standard rock samples of SARM-7, SARM-76, FC-1 and FC-2 were determined by NAAMG method.

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