[en] The amount of trapped hydrogen atoms accumulated in the γ-irradiated samples and their subsequent decay at 77 K were determined from the ESR spectra. The reaction time at 77 K was calculated from the end of γ-irradiation and the radiation yield of trapped hydrogen atoms in 6M sulphuric acid glass γ-irradiated at 77 K. It is stated that the kinetic behaviour of trapped hydrogen atoms depends mainly on matrix relaxation phenomena and the nature of the reactive hydrogen acceptor is of secondary importance. Results are presented by diagrams. (T.I.)