Abstract
IN the course of work on the development of Geiger–Müller counters in this laboratory, some interesting properties of a hard-glass external cathode (‘Aquadag’) counter have been observed. Argon–alcohol counters filled to a pressure of 10 cm. of mercury, having internal diameters of one inch, and using a 7-mil central tungsten wire, were found to have plateaux extending from 1,200 volts to more than 3,000 volts. The slope of these plateaux was generally found to be less than 0.4 per cent per 100 volts. It was noted that the size of the pulses obtained from these counters is reduced with enhanced rate of counting. This phenomenon results in an apparent upward shift of the threshold voltage with increased rate of counting. The slope and length of the plateau remain unaffected by incidence of strong radiation, and the shift in the threshold voltage can be nullified by using a preamplifier at the input of the scaler. The decrease in pulse size and the consequent increase of the threshold voltage are shown in Fig. 1.
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References
Korff, S. A., “Electron and Nuclear Counters”, 95 (New York: Van Nostrand; London: Macmillan, 1946).
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YASIN, M., AHMED, R. & GILL, P. An External Cathode Hard-Glass Geiger–Müller Tube. Nature 167, 647 (1951). https://doi.org/10.1038/167647a0
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DOI: https://doi.org/10.1038/167647a0
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