Abstract
The electronic system of this coincidence counter consists of two 13-stage Venetian blind photomultipliers coupled to a simple DeBenedetti-Richings coincidence circuit, followed by a medium-gain amplifier, pulse selector and scaler. The main feature of the system is its simplicity, chiefly realized by utilizing the quasi-linear transfer properties of the take-the-lesser type coincidence circuit. “Balance-point operation” permits the use of multiplier high voltage supplies and pulse amplifiers not possessing the high stability usually required for scintillation counting. The counter has been operated at 26°C with a tritium counting efficiency of 16% at a background of 100 c/min. The minimum detectable tritium concentration in water is 1.7 × 10−8 curie/liter. However, the time needed for the counter to “quiet down” after a change of sample is prohibitively long, 2–3 days. Of the background, nearly 50% seems to be caused by light interaction between the photomultipliers. Some suggestions for future improvements are given.
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