The general effects of backecattering on measured radiation doses are fairly vell established. Further, knowledge ef depth (tissuse)~dose eurves has edvanced to a quantitative state.® Thus, thare seems to be little doubt that a file badge or dosizeter worn om the persca will over-estimate the gamma radiation dose delivered at e depth ef five centimeters (named depth ef blood forming organs). A major factor in determining this difference is the quality of radiation weder consideration. Ome report®® dealing explicitly with radiation ine fallout field suggests » factar of about 3/64. . DoseJonising National Bureau of Standards Handbook 59. September 24, 1954. MMIT-SlA. EnercyGareRadistion, January 1954. CONFIDENTIAL.