Key points are not available for this paper at this time.
R. L. Erikson, W. Szybalski, Molecular Radiobiology of Human Cell Lines: V. Comparative Radiosensitizing Properties of 5-Halodeoxycytidines and 5-Halodeoxyuridines, Radiation Research, Vol. 20, No. 2 (Oct., 1963), pp. 252-262
Erikson et al. (Tue,) studied this question.