four programs have been written to enable radiobiologists to build a computer data base of cellular dose-survival data , calculate cell survival with a correction for cell multiplicity at the time of irradiation , fit various survival models to the data by iteratively weighted least squares , and calculate the ratio of survival levels corresponding to specified doses or the ratio of doses that produce specified survival levels ( e.g. , oxygen enhancement ratio or relative biological effectiveness ) .
C0007620
cell survival
C0007634
cell