Abstract
Proportional counters filled with tissue equivalent gas mixtures are extremely useful instruments and are being used extensively as sensitive detectors for all types of radiations to measure the energy transferred to small tissue volumes. The linearity of their response is of primary importance. So the investigation and clarification of the physical phenomena taking place in the counter and of the limits within which useful results may be obtained would contribute to a more efficient use and a wider application of these counters. The measured gas gain curves have been fitted to the Diethorn and Williams & Sara gas gain models. The models parameters and their dependence on gas pressure have been determined. It was shown that reduced ionization coefficient α/p is not univocal function of the reduced electric field strength EFS/p.
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