T L oO T TTT LY T TTT a 4 ' “4 - -L a Zz T 4 Io! <q — x be = ul MS 4 Zz 4 <¢ Oo ©O > 4 Er 2 510 0 H q ~ + w - <= oc i “4 > L 10? . Fig. 4 “~ i _t i 41 | 10> 4 1 DAYS POST RETURN a 107 \ 90 . a . Mean Adult Sr Urine Activity Concentration History at Rongelap Atoll 12