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Journal Articles

Chemical composition of sediments from marine shallow-water hydrothermal mounds in Wakamiko submarine crater revealed by multiple prompt $$gamma$$-ray analysis

Shozugawa, Katsumi*; Matsuo, Motoyuki*; Sano, Yuji*; Toh, Yosuke; Murakami, Yukihiro*; Furutaka, Kazuyoshi; Koizumi, Mitsuo; Kimura, Atsushi; Hara, Kaoru; Kin, Tadahiro; et al.

Journal of Radioanalytical and Nuclear Chemistry, 291(2), p.341 - 346, 2012/02

https://doi.org/10.1007/s10967-011-1347-9
 Times Cited Count：3 Percentile：24.98(Chemistry, Analytical)

Multiple prompt $$gamma$$-ray analysis (MPGA), a new quantification method with high energy resolution, was applied to sediments from a marine shallow-water hydrothermal mound. Surface sediments around mounds were collected from the Wakamiko submarine crater located in Kagoshima Bay, southwest Japan, where the hydrothermal system was different from those at other marine shallow-water hydrothermal mounds. All samples were desalted and MPGA measurements were performed for 4,500 s (real time). Event data were obtained using eight CLOVER Ge detectors. We could obtain concentrations of $$^{32}$$S, $$^{55}$$Mn, $$^{75}$$As, $$^{157}$$Gd, $$^{39}$$K, $$^{149}$$Sm, $$^{56}$$Fe, and $$^{85}$$Rb with high sensitivity by MPGA. Furthermore, $$^{32}$$S, $$^{85}$$Rb, and $$^{55}$$Mn have characteristic concentrations only at a mound, suggesting that sediments were sulfated by magmatic fluids at this mound.

Journal Articles

Trace element analysis of environmental samples by multiple prompt $$gamma$$-ray analysis method

Oshima, Masumi; Matsuo, Motoyuki*; Shozugawa, Katsumi*

Oyo Butsuri, 80(11), p.948 - 954, 2011/11

https://www.jsap.or.jp/ap/2011/11/ob800948.xml

The multiple $$gamma$$-ray detection method has been proved to be a high-resolution and high-sensitivity method in application to nuclide quantification. The neutron prompt $$gamma$$-ray analysis method is successfully extended by combining it with the $$gamma$$-ray detection method, which is called Multiple prompt $$gamma$$-ray analysis, MPGA. In this review we show the principle of this method and its characteristics. Several examples of its application to environmental samples, especially river sediments in the urban area and sea sediment samples are also described.

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