[State of the erythron in rats at late periods following acute radiation injury].

During 12 months following whole-body single exposure to ionizing radiation of 6 Gy, the experimental rats did not develop anemia but exhibited appreciable morphofunctional changes in circulating erythrocytes, for instance, shortening of their half-life time and increase in a mean diameter and dry mass. In the bone marrow, the total number of erythroid elements and the index of erythronormoblasts labelled with 3H-thymidine were increased and the time of generation of these cells reduced due to shortening of the presynthetic period.