The Geiger-Mueller (GM) detectors fulfill a wide variety of radiation measurement needs. Probes are available for detection of alpha, beta, and gamma radiation. Some probes are provided with a 360° shield to permit discrimination between penetrating and non-penetrating radiation.
Reliability and ruggedness are built into the GM detectors, with uniformity of construction and field-proven design to assure dependable performance with all the GM survey instruments. Standard MHV type connectors readily allow interchange of all detector probes. The GM counters are fastened to the Model 190 Count Rate and Survey Meter by a Velcro® strap. The life expectancy of the counters ranges from 108 total counts to unlimited life depending on the type of quench gas utilized. Enhanced sensitivity to low-level alpha, beta, gamma and x-ray radiation is achieved when using the unique Model 498-110D Pancake GM Probe.
The scintillation detectors are carefully selected and optically coupled to photomultiplier tubes. The photomultipliers are magnetically shielded with mu-metal and specially shock mounted to provide trouble-free performance. The entire detector, crystal and photomultiplier, are secured in sturdy, cylindrical, aluminum housing. Where appropriate, a thin window has been utilized to provide alpha or low energy gamma response