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Plot of lung cancer risk per 10000 persons per year as a function of absorbed dose in normal tissue. The solid, dotted and dashed lines represent 2 Gy, 3 Gy and 5 Gy fractions. The total dose to the target was 50 Gy for the 2 Gy fractionation schedule and was adjusted for the other fraction sizes (by applying the LQ-model) to achieve the same biological effect. The model parameters were for the initial slope μ = 2.8 per 10000 PY per Gy per year, α = 0.09 Gy-1, α/β = 3 Gy and R = 0.7.
