engleski

A study of argon-isobutane mixtures in a proportional counter : gas amplification, W value, and energy resolution

The mean gas amplification factor, the single electron spectra, the mean energy required to form an ion pair (W), and the energy resolution were measured in argon-isobutane mixtures at various pressures over a wide range of the reduced electric field strengths in a cylindrical proportional counter. In mixtures with low isobutane partial pressure, gas gain is an overexponential function of the applied high voltage. The relative variance of single electron spectra, the apparent W value and the energy resolution are functions of both gas gain and isobutane partial pressure in the mixture. A better energy resolution is obtained with mixtures containing less isobutane at low gas gains whereas at the higher gas gains usually applied in X ray spectroscopy the resolution is degraded.

proportional counter ; argon-isobutane ; gas mixtures ; W valule ; gas amplification ; energy resolution

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