Te Male eT TT TT l oPrrigg tr t ACTIVITY, C/M T jb Me L. Az ZIRCONIUM B= TOTAL SAMPLE - C= CALCIUM- STRONTIUM D = RUTHENIUM el. €=CERIUM F= TRIVALENT RARE EARTHS G = BARIUM ion 40 i i L i 1 4 l l n 1 60 80 100 120 DAYS AFTER M DETONATION, NOVEMBER I, 1952 Fig. 4.12-—Decay curves of radiochemically separated fractions of Rofos dredged sand. wa 64 140