Northern Marshall Islands Aerial Radiation Survey Preliminary Data Summary Bikini Atoll Average Terrestrial Exposure Rate * (uy R/h at 1 meter) Island Number Frame Number. Marshallese Total Name B-1 177 B-2 38 Yurochi — B-3 38 Vorikku B-4 38 Romurikku B-5 38 Aomoen B-6 15 Bikini B-7 7 Bokonfuaku B-8 B-9 7 7 Yomyaran Namu B-10 7 Rochikarai B-11 7 B-12 200 B-13 B-14 Component 32 11.6 35 . 21 9.4 4.7 7.4 31 1.9 0.9 0.4 0.6 1.6 0.9 0.5 55 3.9 Tonchebi 1.0 0.4 0.4 Enyu 2.7 2.3 <0.3 12 12 Airukirau Bigiren 0.5 0.5 <0.3 <0.3 <0.3 <0.3 B-15 12 Reere B-17 34 Endrik 0:3 2.0 12 Eninman | §°Co Component 12 B-16 Eniairo 137Cs Gross Count | 4-6 - 7.9 4.2, 2.2 45 35 7.9 B-18 212 Rukoji 42 29 8.9 B-19 212, Chieerete B-20 215 Arriikan 12.6 9.7 2.8 B-21 215 Ourukaen 9.9 6.3 3.1 B-22 215 Bokoaetokutoku 5.4 2.7 2.9 B-23 215 Bokororyuru 11.4 8.5 3.3 * Extrapolated from aerial data obtained at an altitude of 38 meters (125 feet). An additional 3.3 up R/h due to cosmic ray contributions must be added to obtain the total external exposure rate.