ACTIVITY , C/M A+ ALGA, CAULERPA B = PLANKTON C= SPONGE {tf [— D= DREOGED SAND - E= WRASSE LIVER F = SNAIL (PRESHOT) G= SURGEONFISH MUSCLE 20 | 30 DAYS ! 40 AFTER { 50 M I 60 \ 70 DETONATION , Figure 3. | 80 1 90 NOVEMBER | 100s 1, 1952— Decay curves. ~ 15 - i IO { 120 130