Аннотация:Unlike investigations of the behaviour of electrons, whose role in radiation chemistry of liquids has long been recognized, analysis of the possible contribution of the behaviour of its antiparticle namely, the positron, in condensed media to comprehension of radiation chemistry processes is still in its early stages. Excellent reviews of experimental data on positron annihilation in relation to radiation chemistry of liquids were published in the Proceedings of the VI International Conference on Positron Annihilation.(1) The present work deals with the subjects mainly pertaining to the initial stage of radiolysis of liquids. The information accumulated in literature is considerable. To keep within reasonable bounds, we limited ourselves to the examination of primarily Russian publications that have had the poorest showing in English-language publications.