Ionization measurements and absolute radiation yields in the ?-radiolysis of gaseous hydrogen sulphide

Abstract

Ion currents produced in hydrogen sulphide in a cylindrical ion chamber by y-radiolysis have been measured. Saturation points on the ion current curves were located by application of general recombination theory. These saturation currents were then used to estimate that the average energy W(H2S) required to produce an ion pair in hydrogen sulphide is 25.3f0.4 eV. Other values determined were W(CH3SH) = 25.1 f0.4 eV, W(N20) = 32.7f0.4 eV and W(SFs) = 35.0f0.4 eV. Hydrogen and sulphur are produced upon irradiation, with radiation yields (molecules per 100 eV energy absorbed, or G values) G(H,) = 7.0k0.2 and G(S) = 7.0f0.4 relative to W(HzS) = 25.3 eV. Possible use of the production of hydrogen from the radiolysis of hydrogen sulphide as a gas dosimeter is discussed.

Radiolysis of Hydrogen Sulfide at Very High Dose Rates. The Effect of SF61

“…of these authors in that SF, reduces the hydrogen6 -yield. The decrease we observe is in good agreethe value of W = 25.3 eV per ion pair(8). ThisMOLE PERCENT SF6value of W measured by Huyton and Woodward FIG.2.…”

“…They also reported that this yield is reduced by the addition of SF,, although they did not state by how much. Huyton and Woodward (7,8) y-irradiated gaseous H2S and measured the dose by ion chamber measurements. They report G(H2) = 7.0 _+ 0.2 at 800 Torr and that neither N 2 0 nor SF, has any effect on this yield (7).…”

The High Dose Rate Radiolysis of H2S: Sulfur as an Electron Scavenger

“…Rcently several studies of the radiolysis of hydrogen sulfide have been reported (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) and we have proposed a mechanism based on our measurements at high dose rates (13). While this mechanism is in general agreement with the observed yields there are problems which need further investigation.…”

Radiation chemistry of ethanol :

“…It requires an accurate value of W, the average amount of energy expended in the gas per ion pair formed. The reproducibility of W values from one laboratory to the next is within about 4% (570050,580061,640177,650795,670437,680390,680843,680844,700510,710122).…”