“…Fast, slow and non-repaired strand breaks were considered. For fast repaired strand breaks, which represent the majority after X-irradiation and which are all assumed to be single-strand breaks, repair half-times () ranging from 2 to 10min have been reported ( Edvardsson 1974, Ben Hur andElkind 1974, Dugle and Gillespie 1975, Koch and Painter 1975, Roots and Smith 1975, Dugle et al 1976, Baisch et al 1977, Bryant and Blocher 1980, Dikomey 1982, van der Schans et al 1983). The half-times of slowly repaired trand breaks, which are considered to be double-strand breaks, are generally found in the range of T= 50-300min (Furuno et al 1979, Bryant and B16ocher 1980, B16cher and Pohlit 1982, Dikomey 1982.…”