7b $96 25r o Deviation from Co*° Response , Percent 100 p-— 25h 30 TS 0.2 ie 0.4 _L L 0.6 0.8 1 Energy , Mev 1.0 4 2 Figure 2.5 Energy dependence of dose rate response, Top Hat plastic phosphor, 14-inch diameter by %% inch long. ot” go* -90° -60° ponse 60° -60° a a a “ 60° Go = = ° c a ° c @ a -40° Displacement of Vertical Axis Figure 2.6 Angular response of Top Hat radiation detector, measured with l-mg radium source. oui DCE ARCHIVES (4