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The aim of this study is to ascertain and confirm the source of background noise in cosmic-ray muon radiography (muography) using emulsion film detectors. For this, we build two types of emulsion detectors with different momentum thresholds and perform test measurements of an actual geoscientific target. This experiment reveals that contamination of nonsignal particles with momenta of less than 2 GeV c −1 cause significant systematic errors for the density estimation of muography. Utilizing thedoi:10.5194/gid-3-649-2013 fatcat:tx7il7lpzfgurjjptklwpdirc4