First Sensor is expanding its product range in the area of ionizing radiation detection with a radiation detection module that combines a 100 mm² photodiode with an 8 mm CsI:Tl scintillator. The module measures only 17x16x19 mm, detects gamma radiation in the energy range of 150 to 1,500 keV and is optimized for detection of 137Cs. The pulse output allows for very simple integration in instruments used to measure gamma radiation.