High dynamic range quantitative imaging of hydrogen

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H01990
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 17040:Solid earth sciences-related
• Research Institution: Hokkaido University
• Principal Investigator: Sakamoto Naoya 北海道大学, 創成研究機構, 准教授 (30466429)
• Co-Investigator(Kenkyū-buntansha): 飯塚 毅 東京大学, 大学院理学系研究科(理学部), 准教授 (70614569)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: High dynamic range / Isotope imaging / Ion detector / CMOS imager / Water / Planet

Outline of Final Research Achievements

Hydrogen contained in major minerals of rocky planets occupy a huge volume in the entire planet in spite of its extremely small amount. Therefore, a slight difference in analytical values due to the effect of adsorbed water on the earth has a great influence in the analysis of extraterrestrial materials and high-pressure experimental samples.
We developed a high dynamic range (HDR) ion imaging system by devising a readout method to maximize the advantages of direct isotope imaging.
The newly developed HDR ion imaging system has demonstrated the ability to continuously acquire ion intensity distributions over six orders of magnitude within the same field of view. This system realizes precise imaging dating using radionuclides and hydrogen isotope ratio imaging of anhydrous and hydrous mineral mixtures.

Free Research Field

Cosmochemistry

Academic Significance and Societal Importance of the Research Achievements

固体表面の水素をイメージングする新たな手法を開発しました。この手法では、検出器の読み出し方法を工夫することで、８桁のダイナミックレンジを実現しています。これにより、ほとんど水を含まない無水鉱物が大部分を占める固体惑星の水の総量の推定だけでなく、同位元素の含有量が1000万倍異なるようなミクロンスケールの物質が混在していても、正確にその含有量を分析することが可能となります。