[Tentative classification of radial figures and an evaluation of the consequences of their radiation induction].

A classification is proposed of the tri- and quadriradials, based on theoretical and observed anomalies induced by radiation. Mitotic consequences of radials during S-phase are analysed, and it is shown that the rate of induction of unbalanced rearrangements is very much higher than that of balanced ones. After extrapolation to germ cells, it can be assumed that irradiation during S-phase will induce a high risk of chromosome imbalance for progeny which will be restricted almost entirely to the first generation.