Strontium-90 is now present in the skeletons of all living persons throughout the world as a result of nuclear detonations. Since this isotope is nonuniformly distributed within the adult skeleton, it is necessary to define this distribution in order to more adequately estimate the resultant radiation hazard as well as to evaluate and compare data from a variety of bones of different individuals. The principal bones from many cadavers were analyzed. While some skeletons were assayed very extensively, the bulk of the investigation centered on rib, vertebrae and long bone shaft. In the case of adults, an aliquot of the total body skeleton was also analyzed in each case. In adults the strontium-90 concentration per gram calcium in vertebrae, rib and long bone shaft is 1.8, 1.1 and 0.5 times skeletal average respectively. In newborns and young children, the distribution is much more uniform although these data are more limited. These findings together with the fact that stable strontium is uniformly distributed throughout the adult skeleton show that the nonuniformity of strontium-90 is a temporal function of changing diet. If radiation damage from strontium-90 is a threshold phenomena, the distribution is of particular importance since the highest local concentration areas will first exceed the threshold. If the damage is nonthreshold in character, the distribution is still of some significance since some areas (e.g. bone marrow) are presumably more susceptible to radiation damage than other areas.