Abstract
This paper reports the digital implementation of analog shaping amplifiers by digital pulse processing in gamma-ray spectroscopy. For digital implementation, a numerical algorithm was developed by referring to the semi-Gaussian filter of the analog shaping amplifier. In order to verify the developed algorithm, we evaluated the obtained energy spectrum and compared the energy resolution with the existing analog processing results. The gamma-ray detector used a double-sided strip detector, and the preamplifier signal of the detector was digitized directly by using a commercial digitizer. Using the standard gamma-ray sources Am-241 (59 keV), Ba-133 (81 keV), and Co-57 (122 keV), we were able to detect gamma rays in a relatively low energy region. The energy resolution was improved at energies below 100 keV compared to the result of treatment with an analog shaping amplifier.
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