| Project/Area Number |
61420017
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
鉱物学(含岩石・鉱床学)
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| Research Institution | Naruto University of Education |
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Principal Investigator |
NISHIMURA Hiroshi Associate Professor, Department of Geosciences, Faculty of Science, Naruto University of Education,, 学校教育学部, 助教授 (30029722)
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| Co-Investigator(Kenkyū-buntansha) |
TAKESHI Hideo Professor, Department of Geosciences, Faculty of Science, Naruto University of E, 学校教育学部, 教授 (10029605)
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| Project Period (FY) |
1986 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥30,300,000 (Direct Cost: ¥30,300,000)
Fiscal Year 1989: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1988: ¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1987: ¥10,100,000 (Direct Cost: ¥10,100,000)
Fiscal Year 1986: ¥11,600,000 (Direct Cost: ¥11,600,000)
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| Keywords | Ion microscope / SIMS / Isotopic abundance of iron / 同位体比異常 / マグネシウム / 同位体比変動 |
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| Research Abstract |
Mechanical set-up and arrangement of ION MICROSCOPE, which has been designed and developed for the last four years, have been completed. A high voltage power supply for the discharge of producing primary ions was also constructed. Furthermore, it was tested if main and scanning power supply for the electromagnet of mass spectrometer were clearly worked. As a result of the test mentioned above, these powers supplies were found to be effectively used for the magnetic scanning of the mass spectrometer. In addition to these, two pumping systems of turbo-molecular and oil rotary pumps were added to evacuate the ion ilicroscope chamber. 2 X 10^<-6> Pa was achieved by the pumping. Primary ion source was repaired so as to avoid the discharge between a ground potential part and a high voltage part. By this repair, unexpected discharge in the primary ion source chamber could be avoided and steady primary ions were produced. The detection current of the primary ions which was detected at the first drawing-out electrode to be about 40 muA. The construction of this ION MICROSCOPE was roughly completed.
For the isotopic analysis of iron, laboratory standard of isotopic abundances of iron were determined with high accuracy. Hitachi IMA-2A ion microprobe analyzer of Osaka University was used for this analysis. The abundances were determined as listed in the following. ^<54>Fe= 5.7238<plus-minus>0.0015%, ^<56>Fe= 91.8545<plus-minus>0.0014%, ^<57>Fe= 2.1470<plus-minus>0.0005%, ^<58>Fe= 0.2746<plus-minus>0.0003%.
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