KS. Cc De vedla feheane— 1 + koa na 35 4 THERAPEUTIC APPLICATION OF AADIATION Anérew Hi, Dowdy, be Do Frovessor of Rediolos School of beGieins Universit (Abstract of lecture before University xt en i on course at U.C.L.A. in "The Application of Nuclear Fhysics to the Bi olerical and Medical Sciences",. The selection of radiation for therapeutic use depends upon: {2) the availebility of material (rediation) (2) the experience and exvertness of the Individusl sdministering the P radiation (3) the type and character of the diseese to te treated. In general, the biolcgical results from @!frerent kinds of radiation ere the acme if certein differences in physical cheracteristies are taken Anve coriidgesction. (Te illustrate: one would herdly use a snotgun to eanooy 2 Slr off a wall when a fly swatter weulec do, Hy the same token, eines petlicelotine effectively denonstretes a relectivity for thyroid, le no need to treat cancer of the thyroid by total body raéietion, ive icdire is appliceble as a sexceunterse of thyroid cancers.) valiie it is net generally recognized, particularily among the laity, ratviction therapy is used for other then malienincics. The radiation t reatwent cf lLemphoid hyperplesia in the posterior nesopherynx, a condi-# tion which may cause much of the ceafness amcng children, is a case in oint. tue overgrewth of lymphoié tissues wiich blocks the opening of the * eustachian tube an&@ impairs hsering can be Cestroyed merit owite minute quantities of beta radisticn, by localized treate In approximstely 80% of the cases so treated, one trestment proved erfectisc.s— Tt Is ths opinion of this lecturer that radisticn itself is not the enswer to the cancer problem, nor will the grestest advantace of racio-