Development of an in-situ K-Ar dating method toward understanding of the early evolution of the solar system bodies

2014 Fiscal Year Final Research Report

• Project/Area Number: 26887040
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Rikkyo University
• Principal Investigator: CHO Yuichiro 立教大学, 理学部, ポストドクトラルフェロー (00737687)
• Project Period (FY): 2014-08-29 – 2015-03-31
• Keywords: カリウム・アルゴン年代 / 惑星探査

Outline of Final Research Achievements

We explored the capability of K measurements using a combination of a small, low-energy laser and a high-resolution spectrometer. We found that the K emission lines can be detected from a sample with 300 ppm K2O content when the laser pulse energy was >20 mJ. We obtained the calibration lines for the pulse energy of 20, 30, and 35 mJ. The corresponding detection limits were 2 wt%, 9300 ppm, and 5100 ppm, respectively. We also achieved the relative accuracy better than 20% for a sample with K2O > 1.8 wt%, when the laser pulse energy was > 20 mJ.

Free Research Field

数物系科学