γ-Radiolysis of gaseous H2S + SF6 mixtures

Abstract

Measurement of G(ion)(= 100/W_M) and G(H₂)_M in H₂S + SF₆ mixtures, where W_M is the average energy required to produce an ion pair in the mixture, and G(ion) and G(H₂)_M are the total ion yield and hydrogen yield respectively, enables energy partition parameters a to be calculated. These were found to be a= 1.64 for mixtures of stopping power fraction Z=P₁/(P₁+S₂P₂/S₁), (where P and S refer to pressure and stopping power of gases 1 and 2) between [graphic omitted] 0.2 and 1.0. Below Z [graphic omitted] 0.2 each mixture has its own particular a value and these values, in the main, decrease smoothly with decreasing Z to a [graphic omitted] 0.70 at Z= 0.02. The hydrogen produced in the mixtures from energy deposited in H₂S alone, G(H₂)_H2S, is the independent of SF₆ concentration when energy partition is calculated using these a parameters.

Sulphur yields in the mixture G(S)_M are much greater than G(H₂)_M; the imbalance is accountable by HF production. At low SF₆ concentration (high Z), G(S)_M increases rapidly with SF₆ concentration from 7.0 in pure H₂S to 11.0 at Z= 0.98(½ mol % SF₆).