Northern Marshall Islands Aerial Radiation Survey Preliminary Data Summary Rongelap Atoll Average Terrestrial] Exposure Rate * (uy R/h at 1 meter) Island Frame Marshallese Number Number F-1 167 Naen F-2 167 Piganiyaroyaro F-3 167 Yugui F-4 159 Aerik F-5 159 Yugui F-6 189 F-7 189 Loniuflal F-8 189 Gejan F-9 153 F-10 Total §°Co Component Component 38 36 2.6 27 25 2.0 - - - 33 32 2.3 22 20 1.5 Auknen 16 15 1.1 153 Eriirippu - - - F-11 139 Anielap - - - F-12 139 F-13 139 Kabelle 11 10.3 0.9 F-14 139 F-15 136 Mejatto 6.3 6.2 0.3 F-16 136 - - - F-17 136 Yuzugan - - - F-18 179 Ribiyurigan 5.7 5.1 0.5 F-19 179 Laberedj 9.8 9.9 0.8 F-20 179- F-21 179 Boken 79 7.2 0.6 F-22 179 Gabelle F-23 177 Mellu 4.5 3.9 0.4 F-24 175 Aniejat 7.6 6.5 0.5 F-25 175 Gogan 5.8 4.9 0.5 F-26 175 - - - F-27 175 8.5 7.8 0.6 175 Name 137Cs5 Gross Count F-28 ‘_ Kieshiechi | . | | * Extrapolated from aerial data obtained at an altitude of 38 meters (125 feet). An additional 3.3 » R/h due to cosmic ray contribution must be added to obtain the total external exposure rate.