ScholarWorks@성균관대학교

초록

A compact gamma-ray radiation detector based on a silicon photomultiplier (SiPM) coupled with a GAGG(Ce) scintillator was developed using a simplified signal-processing architecture without conventional front-end electronics, including a preamplifier, shaping amplifier, and discriminator. The proposed detector directly connects the output signal from the driver circuit to a micro-controller unit (MCU) and a multi-channel analyzer (MCA), enabling gamma-ray counting and nuclide analysis with a reduced system complexity. The detector performance was evaluated using Ba-133, Cs-137, and Co-60 radioactive sources. An operating voltage of 60 V was selected, at which stable counting performance with low fluctuation and reduced noise could be achieved. Distance-dependent response measurements showed that the detector fabricated using the proposed circuit presented results consistent with those obtained using a comparator-based circuit and MCNP6 simulation. Gamma-ray energy spectra of single and mixed sources were successfully acquired, and the channel-energy linearity exceeded 0.99. The measured energy resolution for Cs-137 at 662 keV was 7.51%. These results demonstrated that the proposed detector provided reliable radiation counting and spectroscopic capability while significantly simplifying the system structure.

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