The rate coefficients in the model of cell kinetics and mortality introduced by Jones et al. (Radiat. Res. 128, 258-266 (1991)) are estimated using mortality data from several mouse experiments. The evaluated model fits data from a large variety of prompt, protracted, and fractionated irradiations with 250-k Vp X rays with good fidelity. Although the maximum-likelihood estimates are not unique, all estimates lead to greater cell survival than that observed in in vitro experiments on nonterminally differentiated reproducing cells from the marrow.

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