Biologically effective dose
= Biologically effective dose
{title2=$\operatorname{BED}=Nd(1+d/(\alpha/\beta))$}
An effect-equivalent dose derived from the <linear-quadratic radiobiology model>, with a subscript often indicating the tissue's assumed $\alpha/\beta$ in gray. It is distinct from the physical total <absorbed dose> $Nd$. Increasing fraction size at fixed tumour BED can increase the normal-tissue BED when the latter has smaller $\alpha/\beta$.