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A 4-gram tumor is treated with a total dose of 50 Gy of X-ray. The fractionated treatment (25 daily fractions of 2 Gy each) results

A 4-gram tumor is treated with a total dose of 50 Gy of X-ray. The fractionated treatment (25 daily fractions of 2 Gy each) results in an effective survival curve that has no shoulder and a D0 of 2.5 Gy. Assume that 1 gram of tumor contains 109 tumor cells. How many tumor cells survive this treatment? 


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