Yields of Primary Products in Water Irradiated by Tritium β Rays

• Published in: Hoken butsuri Vol. 23; no. 2; pp. 121 - 129
• Main Authors: YAMAGUCHI, Hiroshi, HOSHINO, Kazuo, HIRAOKA, Takeshi, KAWASHIMA, Katsuhiro
• Format: Journal Article
• Language: English
• Published: Japan Health Physics Society 1988
• Subjects: electron track structure; free radicals; prescribed diffusion model; primary products; spur; tritium
• ISSN: 0367-6110; 1884-7560
• DOI: 10.5453/jhps.23.121

Based on the prescribed diffusion model we estimate yields of water radicals by 3H β rays. A radical in a spur reacts with radicals in the same spur and in the nearest neighbour spurs according to the track structure of electrons and to the process of diffusion. The basic idea of the model is that 1) a concept of interspur distance in an electron path segment is introduced to take into account the track structure in the differential equations for many-radical system, 2) the differential yields for each path segment are summed up to give the integral yields by averaging over electron energy degradation spectrum, and 3) G-values of the species formed by 3H β rays are obtained by integration over the primary β spectrum. Optimum values for the parameters in the model were determined by comparison with experiments for Fricke dosimeter. The result indicates that the ratios for H2 and H2O2 exceed one among the ratios of yields of species by 3H β rays to those by 60Co γ rays.