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A method is described for detecting coincidence between the discharges of Geiger counters. The basic circuit uses diodes as coincidence tubes. The output from a diode circuit is the same polarity pulse as the inputs, hence the output from one coincidence circuit can be used to generate more complex coincidences. An example is given of a typical counter-tube experiment utilizing the diode scheme. A formula is developed for the ratio of output for total and partial coincidence in terms of the pulse width and circuit parameters; in a practical case with a pulse width of 1μ second a fourfold to threefold output ratio of 40 is obtained. Mention is also made of a combination diode-pentode coincidence circuit.
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Howland et al. (1947) studied this question.
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