Fig. 3From: Development of a cost-effective plastic scintillator for cosmic-ray muon radiography of a volcanoCount rate of cosmic-ray muons as a function of the distance (X) of the hitting point from the PMT. The ratio of mean pulse height for a minimum ionizing particle and the threshold is ∼10 and ∼30, respectively. Count rate of cosmic-ray muons is normalized to that measured at X = 0.Back to article page