[Experience in the search of new prolonged-action radiation-protective agents]

The cysteamine derivative-guanidinoethanesulfanylthiosulfuric acid was demonstrated to have radioprotective properties protecting mice against X-rays and fission neutron irradiation hazard. Radioprotective efficacy shows itself for 2 hours after i.p. and p.o. administration of the preparation. It was established an opportunity of the prolonged protective action of gammaphos as a result of its cross-linking to dextran. The preparation has a radioprotective action on X-ray and neutron irradiation.