108, | | | q of I | 7 4 HON bo 9 do: & | 3 © Pi Kk iy O TOTAL B-activity e gr 90 +90 ACTIVITY 4 7 105}— — d/m/g ASHL $89 + 5-90 pECaY b= |4 L. ~ 5 f 9 104 > ee QO t/ a i Fig. 3. S tee vee th L' ee ee vi l 100 _. ‘ef 7 T>---lSms \sr90 decay . —— sr89 pecay | 200 van DAYS 300 AFTER 400 MAY 14, SST n [954 500 = —e eo ee 1 600 a _ 700 Radioactivity in Coenobita carapace on successive collection dates compared with the decay of radiostrontium. Values in disintegrations per minute per gram of ash.