PRIVACY ACT MATERIAL REMOVED rate during tnis time period. Further attempts to decontaminate helicopter #26 3x: - “4-39 and 4+ 13 Sours had little or no effect, as decay during this time L.2 3pprOx.mately proportional to t°**, the same decay rate as would be expected from ra’ radioactive decay alone. Decontamination efforts on helicopter #28 reduced inten: from 500 mR/hr at H + 8 to L2Q mMR/hr at H+ 10 (Figure 1). Intensity measurements ir2 ec: reoorted after H + !3 hours and it is assumed the decay rate of helicopter #26 (and tne iit flight deck), remained constant until the 4 November (approximately H+ 77 hours), helicopters were transferred to snor? on After removal of the helicopters, "a through scrubdown of the exterior decks with soap and salt water reduced the intensity to 2 background level" (Reference 3), During the period 1-4 November, the only source 3: significant radiation on the RENDOVAwas the contaminated helicopters. It is assumed <-at mre 35 mR/hr intensity measured on the hangar deck resulted solely from the presence of the contaminated helicopters, Further, it is assumed that subsequent hangar iensities, although not reported, were directly proportional to the intensity helicopters parked above it. This environment is depicted by the dashed line in Figuré ar 8 the environment to which YN3 was exposed when on the hangar deck. or tegrated free-field intensity on the aft hangar deck between H+ 4.5 and H-~- 7? “~e 5 (,269 hours, 4 November) is 242 mR. INITIAL RADIATION DOSE At the time of Shot MIKE, the RENDOVA was 30 miles away, far beyond the rarse ct meaningful radiation exposure. For Shot KING, the distance was 24 miles. In doth cases, te initial radiation dose, including that from neutrons, was zero. RESIDUAL RADIATION DOSE The integrated free-field intensities to which YN3 was exposed are acj.st account for time spent topside (or on an island) and below decks, and for any snie 5 orovided by the ship's structure while below. The adjusted integrated intensities are en converted to an equivalent film badge dose using the conversion factor 2.’ rem ~ 45 Jescribec in Reference 5. It is assumed that during the period 1-4 November YN3 remained onoosr: the RENDOVA (the first Shore Patrol to Japtan Island doesn’t show up in the ceck log 5 November). 7h The fallout contribution on the ship to the integrated intensity curncs 1.8 D PRIVACY ACT MATERIAL REMOVE