A Light Stabilized Photomultiplier Detector Assembly with Pulse and Current Mode Operation

This unit was developed to provide an economical scintillator detector assembly for microprocessor controlled effluent monitoring systems. The Integral high voltage supply is controlled to maintain constant photomultiplier gain from a pulsed light emitting diode reference source. This control method also provides current mode operation if high radiation levels are present. In addition, a simple comparision of the light output pulse gives an assurance of detector operation.