Abstract

Poster Presentations

Day 3, May 21（Fri.）　　Room P1 (Zoom)

3P-29　　PDF

Development of in-situ Analysis for Extraterrestrial Particles with Isotope Nanoscope

(Hokkaido Univ.)
^oYuta Otsuki, Kenichi Bajo, Hisayoshi Yurimoto

Lunar and asteroid regolith contains noble gases irradiated by solar wind. These particles have preserved ancient solar wind corresponding to an activity of the ancient Sun. This record can be measured by depth profiling of noble gases into extraterrestrial samples. In this study, we developed measurement procedure for depth profiling of ⁴He in the lunar ilmenite regolith particle using isotope nanoscope LIMAS. We used indium in order to embed particle in arbitrary angle and position. A reference sample was prepared for comparison, which was a polished ilmenite chip from South Africa. We determined depth profiles for ⁴He⁺, ⁵⁶Fe²⁺, ⁴⁸Ti⁴⁺, ²⁴Mg²⁺, and ¹⁶O³⁺. The depth profiles of the major element ions were obtained, of which standard deviations were less than 10%. This standard deviation is similar to those from the reference sample. ⁴He was also obtained from the uppermost layer of the lunar regolith soil.