Northern Marshall [slands Aerial] Radiation Survey _— Preliminary Data Summary Rongerik Atoll Average Terrestrial] Exposure Rate * (yu R/h at 1 meter) Island Number Frame Number Marshallese Total Name Gross Counts 137Cs Component 6°Co Component G-1 74 Jedibberdib 2.6 2.1 <0.3 G-2 74 Latoback 4.7 4.5 0.3 G-3 70 Moterikku - G-4 70 Mortlock 4.9 4.9 <0.3 G-5 70 Bigonattam 5.2 5.2 0.3 G-6 70 Rongerik 4.8 4.6 0.3 G-7 85 - - " G-8 85 - - - G-9 85 Tarrowatt - - - G-10 64 Bokeredj - - - G-11 64 Enewetak 2.4 2.1 <0.3 G-12 102 Bock 4.7 4.6 0.3 . , - * Extrapolated from aerial data obtained at an altitude of 38m (125 feet). - An additional 3.3 uy R/h due to cosmic ray contributions must be added to obtain the total external exposure rate.