To register the emitted glow from scintillator PIN photodiodes are used. Requires high quality PIN photodiodes with minimal noise, very low dark current. Only a few manufacturers in the semiconductor world can provide such characteristics.. The peculiarity is, that during the installation, not separate PIN-photodiodes are used, a solid piece of silicon, which provides almost the same characteristics for each of the photodiodes. Also, the installation technology has its own characteristics..