etce, - reached the investiprtc,. ct various lave as ten anys after shob tive. The results show apsolute photon source strenztns t . ; Seng eee for each enersy from the various samples, wnile in previous reports only relative line intensities were given. Since eacn sample constituted an accurately determined portion of tne material taken from a fallout collector of known area, an estimate can be made concerning the total gamma source strencth per unit area in the vicinity of the collecting site. . Other than reporting quantitative information on photons emitted per square inch of fallout collection area, this exveriment exemplified better orsanization ge | and preparation in other ways. The samples were pre- pared in standardized containers so that changing geo- metry was never a problem. The spectrometer was "well- seasoned" and denendable and was used without modification throughout the course of the experiment. The instru- ment was improved by the substitution of a Moseley X~-Y plotter for the Brown recorder, Finally the analysis itself was made simpler and more consistent by the use of a@ better way of measuring veak areas.