The general effects of backscattering on measured radiation doses are fairly vell established. Further, knowledge ef depth (tissue)<doss eurves has edvanced to a quantitative state.® Thus, there secas to be little doubt that a film bedge or dosizeter worn om the parsca will cver-estinete the gum radiation dose delivered at a depth ef five centimeters (assumed depth of blood forming organs). A major factor in determining this difference is ths quality of radiation wer considerstion. One report®* denling explicitly ed , cA. y mt i So l. 11 af lin? 1 with radiation in « fallout field suggeste a faster of about 3/4.