2021 Fiscal Year Final Research Report
Development of a tree diagnostic method using cosmic rays
Project/Area Number |
20K22589
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Research Category |
Grant-in-Aid for Research Activity Start-up
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Allocation Type | Multi-year Fund |
Review Section |
0603:Forestry and forest products science, applied aquatic science, and related fields
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Research Institution | Nagoya University |
Principal Investigator |
Nishio Akira 名古屋大学, 未来材料・システム研究所, 研究機関研究員 (30880108)
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Project Period (FY) |
2020-09-11 – 2022-03-31
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Keywords | 樹木 / 宇宙線 / 空洞 / 原子核乾板 / 宇宙線イメージング / ミュオグラフィ |
Outline of Final Research Achievements |
We proposed the use of cosmic rays to investigate the interiors of giant trees. Cosmic rays can easily penetrate the interiors of trees having a diameter of 1.5 m or more, which are difficult to investigate using conventional methods. We conducted two experiments to demonstrate the feasibility of this method. In the first experiment, we detected the difference between the presence and absence of a 0.5 m cavity in a 1.2 m diameter wooden plate. In the second experiment, we measured a cedar tree with a circumference of 11 m, with an unknown internal condition, and compared the data with our simulations. The result predicted that there would not be any cavities larger than 1.0 m in diameter. The cedar tree was then cut and it was confirmed that there were no cavities that were larger than 1.0 m in diameter.
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Free Research Field |
物理学
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Academic Significance and Societal Importance of the Research Achievements |
本研究では宇宙線を用いて巨樹の内部を調べることを提案し実証した。従来手法では調査が難しかった直径1.5m以上の樹木の内部を、宇宙線であれば容易に透過し調査することが可能である。本研究によって巨木に対する宇宙線を用いた空洞調査手法の有用性が確認された。今後、立木に対してもこの手法を適用し、巨木の保全に活用されることが期待される。
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