| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2011: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
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| Outline of Final Research Achievements |
Long-lived radionuclides are produced by cosmic rays in surficial materials on Earth, and used for determinations of cosmic-ray exposure ages and erosion rates. The purpose of this study is a development of new cosmic-ray exposure age measurements using cosmogenic nuclides.
(1) Study of fast muon induced nuclear reactions: Most of radionuclides in deep underground are produced by fast-muon-induced nuclear reactions which is not known well. In this study, by muon irradiation experiments, it was found that the mechanism of the nuclear reaction induced by a fast muon is similar to by a photon.
(2) Development of cosmic-ray exposure age measurement using cosmogenic nuclides in magnetite: Quartz is routinely used as the target minerals for these geomorphological studies. In this study, it was indicated that magnetite is also available for the cosmic-ray exposure age measurement. Then, chemical experimental procedures for magnetite samples were facilitated to be used widely.
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