D. Pearl Harbor Radiological Survey After arrival at Pearl Harbor Naval Shipyard at 071550 (H+175), the Atomic Defense Officer discovered radiation levels as high as 40 mr/hr (ref. 7) and the crew was "evacuated to the receiving station" (100200) except for special détails. Subsequent radiological survey (appendix A) revealed the following general gamma backgrounds adopted here to a reference time of 120900 March, (H + 288 hrs). 6 oe _vhile Weather decks Rogge < 5 mr/hr Ship interior Rogs < 1 mr/hr . . 2 appendix A lists specific items scattered throughout the ship which ex- ‘ceeded these levels, the average dose rates were probably below these levels. Converting these dose rates to H+] unit reference rates (R, ) gives; Ry (Deck) = 4.5 r/hr Ry (Interior) = 0.9 r/hr. E. Variation of Dose Rate With Time Two primary factors can change the dose rate at a given location. First, radioactive decay which will be estimated by use of equation (2) for each of the times of interest (see Table 5 below) and; second accumulation or depletion of activity by physical processes. Of specific interest here is the effect of . the weather in removing some of the fallout which is assumed to have been deposited on PATAPSCO at H+32.5 hours. Table 3 extracted from the PATAPSCO . deck log summarizes appropriate wind and rain periods during the return trip to Pearl Harbor.