Evaluation of dosimetry characteristics of a Silicon Photo-Multiplier with a plastic scintillator by Cs-137

A Silicon Photo Multiplier (SiPM) is states of arts radiation detector, it is alternative to PM-Tube. But, availability research of SiPM is not entirely satisfactory. In this study, we suggest the radiation detector module coupled with the SiPM and the plastic scintillator, and then, evaluate the availability of detector module for Cs-137 dosimetry. To confirm the dosimetry characteristics, we experimented count difference depends on equivalent dose rate and equivalent dose comparing with MCNP calculation, and, calculating the conversion coefficient depends on count rate and total count that finding the region keeps the linearity of calculating the dose. These experiment results means the SiPM with the plastic scintillator is able to use the dosimetry application for Cs-137. New detector module has the advantages that smaller volume than GM Tube and ion chamber and the lower price than indirect detector module using inorganic scintillator as CsI(TI). So, it will helpful to relieving the public anxiety about radiation exposure by popularizing the dosimetry device.