The Ludlum Model 44-20 Gamma Scintillator detector uses a Teledyne Integral Detector assembly containing a 7.6 cm (3 in.) diameter x 7.6 cm (3 in.) thick NaI(Tl) crystal optically coupled to a photomultiplier tube (PMT). (Compare to Model 44-11 with 5.1 cm [2 in.] crystal.) The detector is compatible with general purpose survey meters, ratemeters, and scalers for high-energy gamma detection of approximately 60 keV to 2 MeV range. It provides high sensitivity for surveying and pulse height discrimination for single channel or multi-channel applications.
