ENC Measurement for ASIC Preamp Board as a Detector Module for PET System

• Main Author: N. Nagara
• Format: Article
• Language: English
• Published: Center for Development of Nuclear Informatics, National Nuclear Energy Agency (BATAN) 2016-08-01
• Series: Atom Indonesia
• Subjects: Positron emission tomography; Equivalent noise charge; Application-specific integrated circuit; Avalanche photodiodes
• Online Access: http://aij.batan.go.id/index.php/aij/article/view/506

We developed a gamma ray detector with an LuAG:Pr scintillator and an avalanche photodiode as a detector for a positron emission tomography (PET) system. Studies have been performed on the influences of gamma irradiation on application-specific integrated circuit (ASIC) preamp boards used as a detector module. As a device used in nuclear environments for substantial durations, the ASIC has to have a lifetime long enough to ensure that there will be a negligible failure rate during this period. These front-end systems must meet the requirements for standard positron emission tomography (PET) systems. Therefore, an equivalent noise charge (ENC) experiment is needed to measure the front-end system's characteristics. This study showed that minimum ENC conditions can be achieved if a shorter shaping time could be applied.