Accurate and efficient determination of boron content in volcanic rocks by neutron induced prompt gamma-ray analysis |
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Authors: | T Sano T Fukuoka T Hasenaka C Yonezawa H Matsue H Sawahata |
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Institution: | (1) School of Earth Sciences, Faculty of Integrated Human Studies, Kyoto University, 606-01 Kyoto, Japan;(2) Department of Chemistry, Gakushuin University, Tokyo, Japan;(3) Centers for Northeast Asian Studies, Tohoku University, Sendai, Miyagi, Japan;(4) Department of Chemistry and Fuel Research, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, Japan;(5) Tokai Establishment, Research Center for Nuclear Science and Technology, University of Tokyo, Tokai-mura, Ibaraki, Japan;(6) Geothermal Research Laboratory, Kyoto University, Noguchibaru, 874-0903 Beppu, Japan |
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Abstract: | An accurate and efficient analytical method using neutron-induced prompt γ-ray was developed for the determination of boron
contents in volcanic rocks. We corrected the effect of sample geometry and flux fluctuation by using silicon as an internal
standard. However, we found that the slopes of the calibration line vary among volcanic samples with different matrix. Because
the increase of boron activity correlates positively with γ-ray count rate of hydrogen (water), we call this as the hydrogen
effect. The hydrogen effect was confirmed by our experiment in which the boron activities showed systematic increase with
the amount of added hydrogen (water). Most volcanic rocks, however, contain little water (<2 wt.%) to show this effect. We
determined boron contents in various volcanic rocks in order to confirm the validity of the procedure that we established.
The analyzed boron contents agreed well with the previous reported values. For efficient PGA of boron in volcanic rocks, we
recommend JB-2 (GSJ standard rock) as a single geochemical standard, because of its high boron content (31.2 ppm). |
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