BED = biologically effective dose EQD_{2} = dose in 2 Gy fractions biologically equivalent to dose D given in fractions of size d, in units of Gray

E is biological effect, D is total dose (D = nd), d is dose per fraction, n is the number of fractions, and alpha/beta is a property of the irradiated tissue.

BED equation is based on Hall and Giaccia, Radiobiology for the Radiologist, 2012, Lippincott Williams & Wilkins. EQD_{2} equation is based on Joiner and van der Kogel, Basic Clinical Radiobiology, 2009, Hodder Education.

This page is part of RBApp, an online radiobiology calculator.