Design of the radiation detector modules for security systems

In this work presented the results of research of the newest silicon photodiodes manufactured by Zecotek company. The new photodiode has the following parameters sensitive area- 3.7mm 3.7 mm, density of pixels - 10000 pixels / mm², photon detection efficiency - 35-40% (at wavelength of 450-550 nm) and operation voltage-91V. The gamma ray detector modules demonstrated a perfect linear behavior of detected signal amplitudes as a function of the gamma ray energy (from 26.3 keV up to 1.33 MeV). Energy resolution for 662 keV gamma rays was 11.2% and the minimum detectable energy was 26.3 keV.