Experimental Study of the w-Values and Fano Factors of Gaseous Xenon and Ar-Xe Mixtures for X-Rays.

An experimental study of the ω-values and Fano factors for Ar-Xe gaseous mixtures at atmospheric pressures for 5.895 keV X-rays was carried out with two experimental set-ups based on gas proportional scintillation counter techniques. For the 100% Xe, Ar-40% Xe, Ar-20% Xe and Ar-10% Xe mixtures at 800 Torr the measured ω-values were 21.61 eV, 21.63 eV, 21.64 eV and 21.42 eV, respectively, within an accuracy of ±0.21 eV. For the same mixtures the Fano factors were 0.254, 0.258, 0.250 and 0.256, respectively, within an accuracy of about ±0.004. For lower Xe concentrations of 5%, 3% and 1% the Fano factors were ≈0.24, ≈0.23 and ≈0.22, respectively. These experimental results are compared with those available in the literature. [ABSTRACT FROM AUTHOR]