Abstract
The counting rate meter is an electronic amplifier and computing circuit whose output is a d.c. current or voltage proportional to the number of pulses fed into the circuit. The input pulses may be either uniformly spaced or distributed randomly in time, as in the most common use of the instrument as an amplifier and recorder for use with Geiger-Müller counters. The electronic design and operation is discussed for each of the circuit components: amplifiers, pulse equalizer, integrating circuit, degenerative vacuum-tube voltmeter, and the stabilized high voltage and low voltage supplies. The statistical interpretation of the counting rate meter output readings due to the randomly distributed pulses from radioactive sources requires a special statistical theory because an integrating and averaging circuit produces an exponential interdependence of successive observations on all preceding observations. Practical methods, with curves, are developed for determining the mean counting rate and the probable error of the mean rate directly from the output records.
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