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Poster Presentations
Day 2, June 11（Tue.） Room P1 (Multipurpose Hall)・Room P2 (Conference Room 101+102)
- 2P-19
Development of in situ Helium Isotope Imaging of Meteorites
(1Hokkaido Univ., 2NIMS, 3JEOL, 4Osaka Univ., 5Kyushu Univ.)
oKen-ichi Bajo1, Noriyuki Kawasaki1, Isao Sakaguchi2, Taku Suzuki2, Satoru Itose3, Miyuki Matsuya3, Morio Isihara4, Kiichiro Uchino5, Hisayoshi Yurimoto1
Isotope imaging is commonly used to investigate the localization of trace elements and their isotopes. In situ noble gas analysis of meteorites revealed the distribution of primordial noble gases that were trapped in the building blocks of asteroids and planets during the early stage of the Solar System. Solar wind noble gases are among the primordial gases present in meteorites and were trapped through exposure to solar wind. High spatial resolution in-situ noble gas analysis is crucial for identifying the carrier phase of the solar wind noble gases. We have developed 4He isotope imaging utilizing secondary neutral mass spectrometry with strong field post-ionization. This technique achieved a lateral resolution of 2 µm and a 4He detection limit of 2 x 1017 cm–3. This development allows for the study of 4He incorporation in the solar wind gas-rich meteorite, Northwest Africa 801 carbonaceous chondrite, with micrometer-resolution.