Abstract
The extension of the Standard Man concept, insofar as radiation protection is concerned, is considered to provide a basis for estimation of dose when exposure of a population is in question. Discussion is organized around three main considerations: (1) data of a physical and chemical nature concerning the principal organs and tissues; (2) data of metabolic nature concerning bodily intake and excretions; and (3) ranges of individual variation that are not uncommon and means of allowing for these differences.