_ 4 » Project 6.5 - DECCNTAMINATICN AND PROTECTION Project Officer ~ J. C. Maloney Objectives The objectives of this project were to determine relative contamination and decontaminability of outside construction surfaces exposed to fall-out BEELGLCD Instrumentation A set of fourteen ft sq panels of widely used exterior construction surfaces was mounted at normal orientations on the barge anchored at Station 650 (approximately 7 miles SW of Ground Zero), It was expected that this ~ station would te in the fall-out area following the shot. Procedures The barge was towed to Farry Island eighteen hours after the detonation. The panels wers unloaded and transported to the dacontamination area where they were mounted on racks at normal pitch and spaced far enough apart to minimize background effects. Then the panels were subjected to high pres- sure hosing and water scruboing techniques. Gamma and beta intensity readings ware taken at 16 points on each surface initially and after each dscontaminaticn procedure. For comparison, these readinzs were ccrrected to a common basis of H + 28) hours (tims of initial survey) dy the use of the -1.2 law. Pesidual intensity levels in cercant wire calculated for aach decontani“ation srocedurs used, Pasults Tne averacs initial panca intensity and residual intensity percentages eo sunnmarized in Table 6,S=#l for each surface. 7 veeSU af AG 7 aa | | de