Mill A J, Lewis J D, Hall W S
Br J Radiol. 1976 Apr;49(580):357-9. doi: 10.1259/0007-1285-49-580-357.
HeLa cells have been irradiated in a beam of pi--mesons using fractionated exposures. The response-time curve for cells irradiated in the peak and in the plateau regions showed evidence of recovery. For cells irradiated in the post-peak position recovery was either absent or delayed.