Abstract
Muon radiography (muography) is a powerful technique for probing the internal density profiles of volcanoes. A nuclear emulsion is a desirable detector for this purpose because of its light weight and because it does not require electricity for operation. One technical problem, however, is an existence of background noise signals caused by low energy charged particles. The present work proposes the use of Emulsion Cloud Chamber (ECC), which is a repeated structure of emulsion films and passive metal plates, to reject these noise particles. The performance of the background reduction is demonstrated by a test measurement at Showa-Shinzan Lava Dome, Hokkaido, Japan.
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