Aerokoj}-Eneman Complex: 1l Atoll L exposure » island asured ) ur/hr. 2s due to 0 to or mund to "om go Co : Sites utions .Opes a? Ce, marized Aerokoj, Aerokojlol Bikdrin, Lele 1-10 6-10 Eneman 1-570 East Eneman West Eneman Enidrik East Enidrik West Enidrik Lukoj Jelete Oroken Bokaetoktok Bokdrolul Bokbata Aomen-TIroij Complex: Aomen Lomilik Odrik, Iroij * * f° co, +25 sp, 1°2Mpy, 1-10 20-570 3-235 ®°co, **5sb, 1°2Mp, 3-30 10-235 60-200 ®°co, **8sb, 60-130 15-45 10-35 * * * 1¢2Mp, 20-50 10-30 ®°co, **7’ es 5-20 * 20-330 10-40 *°co, **®sb | * ES *No soil sample or field spectra measurements. ajyor ibutors It should be noted that these are the ranges of our measure- ments. It is guite likely that there are locations where the local exposure rates are higher than the upper limits given in the table. Since *°’cs has a half life of 30.5 years as compared 137 Cs to half lives of 2.7 and 5.2 years for ***°Sb and *°Co, respectively, the exposure rate levels on islands where *37Cs was the major contributor, most importantly Bikini, can be expected to persist at almost the current levels for some time to come with only slight reductions due to decay and weathering. Studies of *°’cs penetration into soils usually have indicated that in undisturbed soils with high organic content very little penetration of *°”Cs takes UG, F\ RCH DoF A