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LQ-linear (high dose per fraction)

D_t = 20.00 Gy

−ln⁡S={αD+βD2D≤DtαDt+βDt2+γ(D−Dt)D>Dt-\ln S=\begin{cases}\alpha D+\beta D^2 & D\le D_t\\ \alpha D_t+\beta D_t^2+\gamma(D-D_t)& D>D_t\end{cases}

LQ is applied only up to D_t = 2 α/β; beyond that the survival curve is linear with slope γ = α + 2 β D_t.

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