SLIDE 8 Estimates of airborne activityconcentrations. Air activity concentration at Rongelap and Sif ststand ware tabulated from the meteorology results provided by Peterson for 14,404 i 3(Pe8l). Also, results for air activity concentrations of I and 35 were estimated from the Bikini Ash composition and tabulated for comparison. Details on this method are given by Lessard (Le84b). The cumlated activity agree somewhat, however the instantaneous airborne activity concentrations do not agree well. In summary, the Peterson approach towards estimating dose to the exposed Marshallese requires further refinement in order to achieve correspondence with all available information regarding external exposure and exposure rate. AIR ACTIVITY CONCENTRATIONS AT RONGELAP Time Post Detonation, Hours 5 7 10 14 17 Bq M ” 1981, Peterson ——— 131; 1337 7.4 250 15,000 74 ll 250 7,400 110,000 1,500 250 13 1984, Lessard ee iTy 1337 3,700 1,100 19 0 0 110,000 25,000 330 0 0