2006 Fiscal Year Final Research Report Summary
Development of high-density and high-precision analytical method of cosmic-ray produced radionuclei in ice core samples
| Project/Area Number |
16201005
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | National Institute for Environmental Research |
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Principal Investigator |
SHIBATA Yasuyuki National Institute for Environmental Studies, Environmental Chemistry Division, Director, 化学環境研究領域, 領域長 (80154251)
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| Co-Investigator(Kenkyū-buntansha) |
UEHIRO Takashi National Institute for Environmental Studies, Laboratory of Intellectual Fundamentals for Environmental Studies, Director, 環境研究基盤技術ラボラトリー, ラボラトリー長 (90132844)
TANAKA Atsushi National Institute for Environmental Studies, Environmental Chemistry Division, Senior Researcher, 化学環境研究領域, 主任研究員 (80171734)
NAGASHIMA Yasuo University of Tsukuba, Comprehensive Human Sciences, Professor, 人間総合科学研究科, 教授 (60091914)
MATSUZAKI Hiroyuki The University of Tokyo, Department of Nuclear Engineering and Management, Assistant Professor, 原子力研究総合センター, 助教授 (60313194)
HORIUCHI Kazuho Hirosaki University, Faculty of Science and Technology Department of Earth and Environmental Sciences, Assistant, 理工学部, 助手 (00344614)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Cosmic ray-produced radio nuclei / Ice core at Dome Fuji / Accelerator Mass Spectrometry / ^<10>Be,^<26>Al,^<36>Cl |
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| Research Abstract |
In this study, development of analytical methods for cosmic ray-produced long-lived radionuclei in the ice core sample, i.e., ^<10>Be, ^<26>Al and ^<36>Cl, have been successfully conducted by modifying / developing ion sources and detectors of accelerator mass spectrometer (AMS) as well as improving sample preparation techniques. All these three radionuclei could be detected in the real ice core samples obtained at Dome Fuji in Antarctica. The effect of solar activity change during "little ice age" between 1500-1800 AD could be detected clearly in the ^<10>Be data obtained from ice core samples with less than 10 g weight. Another challenging topics of analyzing ^26<Al> in ice core samples were also succeeded, although further improvement of beam strength as well as ionization efficiency will be needed for decreasing necessary amount of precious ice core samples. ^<10>Be/^<36>Cl data, on the other hand, showed considerable deviation from the previous reports obtained in other places. This may suggest the variation of initial ^<10>Be/^<36>Cl values depending on the time/location, indicating difficulties to use ^<10>Be/^<36>Cl data for dating purposes. The techniques established in this study will be used for the analysis of these radionuclei in the 3,000 m ice core sample obtained from Dome Fuji in order to conduct supplemental dating as well as to elucidate solar climate change, geomagnetic change and global climate change in the last million years.
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Research Products
(44 results)
