\ 5 a. wn - ae : a a ae - : : ~ . - (4) Go clarity the relative tumorigenic importance of direct and indirect effects of irrudiation on tne wnayroid gland. —\ , : . . oe = . : (5) To determine the influence ov metabolic and endocrinologic eo ana age and sex on tne pavnogenusis of thyroid lesions. The givaslon of Rudiologleal Mculth currently has under way, or in an advanced wowace oF ylenning, a scrics ov mutuclly supportive epidemind vadioblclogic svucles crogramacatically directed toward the proaé opiectives listed adove. These studies, very briefly described, are aS ToLLows:,