Studies of the dynamics of cesium accumulated in fish with imaging mass spectrometry

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K17861
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Aquatic life science; Risk sciences of radiation and chemicals
• Research Institution: Osaka University
• Principal Investigator: Aoki Jun 大阪大学, 理学研究科, 助教 (90452424)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: イメージング質量分析 / 生物動態

Outline of Final Research Achievements

The purpose of this research is to clarify the dynamics of cesium accumlated in the body of fish by using imaging mass spectrometry. Because of the improvements of the our imaging mass spectrometer and the establishment of the sample processing method, the spatial resolution was reached to 1 μm and the measurement time was significantly reduced. With this device, the cesium distribution of the whole body of the fish was measured. As a result, cesium was detected in the digestive system after ingestion of cesium, and cesium was spread to the whole body in about 3 days. Furthermore, it was confirmed that the amount of cesium in the fish was reduced to half after 30 days.

Free Research Field

質量分析学

Academic Significance and Societal Importance of the Research Achievements

本研究では、イメージング質量分析技術によって魚類におけるセシウムの蓄積動態を測定した。これにより魚の食べた食物中のセシウムが、消化器系から吸収されて全身に移行する様子が明らかとなった。さらにその後、30日をかけて生体内のセシウム濃度が低下する過程が確認された。この過程は、放射線セシウムに汚染された生物の扱いについて、重要な示唆を与えるものである。