PRIVACY ACT MATERIAL REMOVED rate during this time period. Further attempts to decontaminate helicopter #26 between H+9 and H+ 13 hours had little or no effect, as decay during this time period is 1.2 the same decay rate as would be expected from natural approximately proportional to t""“, radioactive decay alone. Decontamination efforts on helicopter #28 reduced intensities from 500 mR/hr at H+ 8 to 120 mR/hr at H + 10 (Figure 1). Intensity measurements are not reported after H + 13 hours and it is assumed the decay rate of helicopter #26 (and the aft flight deck), remained constant until the 4 November (approximately H +77 hours). helicopters were transferred to shore on After removal of the helicopters, "a through scrubdown of the exterior decks with soap and salt water reduced the intensity to a background level" (Reference 3). During the period 1-4 November, the only source of significant radiation on the RENDOVA was the contaminated helicopters. It is assumed trit the 35 mR/hr intensity measured on the hangar deck resulted solely from the presence -5 the contaminated helicopters. Further, it is assumed that subsequent hangar decx intensities, although not reported, were directly proportional to the intensity ‘of the helicopters parked above it. This environment is depicted by the dashed line in Figure | and is the environment to which YN3 was exposed when on the hangar deck. The integrated free-field intensity on the aft hangar deck between H+4.5 and H+ 77 hours (1200 hours, 4 November) is 242 mR. INITIAL RADIATION DOSE At the time of Shot MIKE, the RENDOVA was 30 miles away, far beyond the range of meaningful radiation exposure. For Shot KING, the distance was 24 miles. In both cases, the initial radiation dose, including that from neutrons, was zero. RESIDUAL RADIATION DOSE The integrated free-field intensities to. which YN3 was exposed are adjusted to account for time spent topside (or on an island) and below decks, and for any shielding provided by the ship's structure while below. The adjusted integrated intensities are then converted to an equivalent film badge dose using the conversion factor 0.7 rem/R as described in Reference 5. It is assumed that during the period 1-4 November YN3 remained onboard the RENDOVA (the first Shore Patrol to Japtan Island doesn't show up in the deck log until 5 November). The fallout contribution on the ship to the integrated intensity during this VED PRIVACY ACT MATERIAL REMO