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A compact counting system utilizing integrated circuits and a solid state detector.

A counting system for determining the activity of alpha-contaminated smears has been designed and built utilizing integrated circuits and a silicon surface barrier detector. The use of integrated circuits makes it possible for the complete system, including the detector, timer, scaler and readout, to be contained in a double-width AEC standard Nuclear Instrument Module. This permits five alpha smear counting systems to fit into the space required for one conventional scaler. The 350 mma detectors provide a counting efficiency of 25% for a 110 mm* sample. The 24-V bias required for the detector is readily available from the NIM Bin power supply and no external high voltage supply is required. Timing is provided by scaling clock pulses from a unijunction transistor oscillator and counting times from 0.1 min to 80 min may be selected on the front panel. Scaling of the clock and detector pulses is accomplished by using a binary coded decimal decade counter. The output of the detector counter is displayed on NIXI tubes. Half inch NIXI tubes are used which facilitates fitting three decades in a double-width module. The units have proven successful during the first year of operation as demonstrated by their continued reliability and high degree of user acceptance.