46 THEORETICAL THE BHORTER-TERM BIOLOGICAL HAZARDS OF A FALLOUT FIELD CALCULATIONS OF THE GAMMA RADIATION SPECTRUM, ETC. vo! 1,00 Source Strength Normolized to 1 Mev. 980 #e,) Dtr,E} és ENERGY (Mev) Fiavat 7.—Sample polyenergetic point isotropic source, integral dose spectrum at 1,000 yards. preferentially in a forward direction would suggest that the spectrum incident on the presenting surface of any real target—such as a human torso—would be even “harder” than that shown here. This spectrum is vastly more energetic than conventional laboratory sources or than fallout radiation; and insofar as this greater hardness may affect depth dose curves or relative biological effectiveness, biological data derived from exposure to initial bomb gamma radiation should be suitably corrected before being applied to fallout or other conditions. paper, this conference.) (See Dr. Bond’s E,(Mord Fiaunn 8.—~ Fission product gamma source spectra. 47