Development of a Nondestructive Inspection Method for Trees Using Cosmic Rays
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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