A COST-EFFECTIVE QUASI-ZERO DEAD TIME DIGITAL MULTI-CHANNEL ANALYZER

Hung Tien Dinh, Chien Kim Dinh, Hiep Van Cao, Anh Huy Phan, Vu Minh Hoang

Abstract


This study presents a design of digital multi-channel analyzer (DMCA) based on field programmable gate array (FPGA), which could be integrated into the real-time radiation monitoring system. The algorithms of pulse shaping filter, detecting peaks and spectrum histogram processing are optimized and performed through the digital signal processing method (DSP) using FPGA resource, leading to cost-effective hardware. The pile-up problem is processed carefully to obtain excellent spectrum in high count rate. The prototype DMCA was examined with a NaI(Tl) detector and compared with the commercial system (DSPEC of ORTEC). The experiment results of Cs137 and Co60 gamma ray spectrum show that its performance is consistently superior to the DSPEC. This prototype system is highly promising for multi-DMCA system in considering performance, cost and size.

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