| Project/Area Number |
26610183
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geochemistry/Cosmochemistry
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| Research Institution | Osaka University |
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Principal Investigator |
Terada Kentaro 大阪大学, 理学(系)研究科(研究院), 教授 (20263668)
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| Co-Investigator(Kenkyū-buntansha) |
石原 盛男 大阪大学, 理学(系)研究科(研究院), 准教授 (30294151)
中村 亮介 大阪大学, 産学連携本部, 講師 (70379147)
豊田 岐聡 大阪大学, 理学(系)研究科(研究院), 教授 (80283828)
青木 順 大阪大学, 理学(系)研究科(研究院), 助教 (90452424)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 局所分析 / 太陽系年代学 / 年代測定 / 同位体 / 局所同位体分析 / 隕石 / SIMS |
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| Outline of Final Research Achievements |
Secondary Ion Mass Spectrometers (SIMSs), which have high spacial resolution (1~10 micron), have been used for isotopic measurement of individual minerals and/or presolar grains. The weakest point of this analytical method is that secondary ion yield is very low (less than 1 %). As a result, a large amount of sputtered atoms and molecules that are neutral are wasted.
To overcome this weakness of SIMSs, we adopted the post-ionization method using high-intensity laser, and have developed a multi-turned TOF-SIMS with a femto-second laser for post-ionization. By optimizing the timing of irradiation/acceralation and/or position of laser, we currently attain the multiplication factor of c.a. 10000. As a result, we succeeded in detection of U and Pb ions from natural zircon of which U concentration is about 100 ppm.
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