The Biological Effective Dose (BED) is defined as the theoretical total absorbed dose required to produce a certain effect using an infinite number of infinitesimally small absorbed dose fractions or with an infinitesimal absorbed dose rate.
Academic References
Fowler JF. The linear-quadratic formula and progress in fractionated radiotherapy. Br J Radiol. 1989;62(740):679-694. doi:10.1259/0007-1285-62-740-679 See:https://www.ncbi.nlm.nih.gov/pubmed/ 2670032