| Budget Amount *help |
¥40,950,000 (Direct Cost: ¥31,500,000、Indirect Cost: ¥9,450,000)
Fiscal Year 2018: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2017: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2016: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2015: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2014: ¥12,870,000 (Direct Cost: ¥9,900,000、Indirect Cost: ¥2,970,000)
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| Outline of Final Research Achievements |
We have been trying to obtain precise age data from samples through the U-Th-Pb radioisotope dating method. We first reported the U-Pb age data from tiny minerals using a plasma mass spectrometry coupled with laser sampling technique (LA-ICPMS). Since then, uncertainties in the resulting age data could be remarkably reduced through the introduction of (a) shorter wavelength and shorter pulse duration laser (UV-femtosecond laser), and (b) new ion detection system using Daly collector device to extend the dynamic range. With the present LA-ICPMS technique, the U-Th-Pb dating method can cover 99.98% of the Earth Time (i.e., the application range becomes from 0.1 to 4600 Myrs). Both the better analytical precision and shorter analysis time could be achieved by the MC-ICPMS. With the LA-MC-ICPMS technique, analysis time for the dating can be reduced to be < 1 second/sample, and thus, we can define the “distribution pattern” of the ages from series of rock samples (i.e., Age Cytometry).
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