Dose, Absorbed 2 : The amount of energy deposited in any substance by ionizing radiation per unit mass of the substance. It is expressed numerically in rads (traditional units) or grays (SI units)
Health Physics Society (HPS), Radiation Terms and Definitions, Virginia, USA 2014. http://hps.org/publicinformation/radterms/#, (Rad Sfty, Prot and Cont - Amer) {825}