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Purpose: We compared gastrointestinal toxicity of single vs. fractionated total body irradiation (TBI) administered at dose rates ranging from 0.021 to 0.75 Gy/min in a canine model of marrow transplantation.Methods and Materials: Dogs were given otherwise marrow-lethal single or fractionated TBI from dual 60 Co sources at total doses ranging from 8-18 Gy and delivered at dose rates of...