Abstract
An in situ detection method for beta-ray distribution was developed. The method uses the gamma-ray sensitivity difference between two scintillators: a cadmium–tungstate (CdWO4) scintillator and a plastic scintillator. The gamma-ray sensitivity ratios for several gamma-ray sources such as 137Cs, 60Co, 22Na, and 54Mn were experimentally characterized. The sensitivity ratio for 137Cs between the CdWO4 and plastic scintillators was 8 ± 0.32, while the sensitivity ratio for beta rays from 90Sr was 1.03 ± 0.006. The beta-ray contributions to the total counts can be evaluated using this characteristic. A combined beta-ray and gamma-ray source was prepared, and its beta-ray distribution was successfully obtained using the proposed method.
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