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FIGURE 5. Survival of GM-CFCs as function of initial dose rate (lower abscissa) and absorbed dose (upper abscissa). Mice were irradiated chronically with exponentially decreasing dose rates (dose-rate decrease half-time = 222 h) of external 137Cs
-rays (26) and killed on seventh day after initiation of irradiation. Absorbed dose is calculated by integrating dose rate over 7-d irradiation period. Open and closed symbols represent data for two independent experiments.