WORLDWIDE EFFECTS OF ATOMIC WEAPONS 770 900 630 800 560 700 490 ~ E & 600 ~ 250 > E 420 ~ E & 0.175 0.140 — : 700 0.20 Broken tine > daily accretion in body weight (each large division equals 10 gm) Calcium (gm) 1000 300 150 0.108 8 too BIOMEDICAL CONSIDERATIONS 0.070 50 0.035 > 2 = = 500 350 5 a = 2 w 400 280 300 210 200 140 100 70 4 6 8 10 12 14 16 18 Age (yr) Fig. 4—Daily accretion of calcium and strontium in humans 30 oO 2 4 6 8 10 Age (yr) 12 14 16 18 0 20 3 Fig, 3—Accumulation of calcium and strontium in humans wa oO CaO (gm) No oS 25 transformation of cartilage to bony structure. As the bone growsin length the deposited minerals will be found farther away from the ends of the bone. ; Another important aspect concerns the dynamic equilibrium of calcium and strontium deposits in the bones, It is well known that the calcium ; lemafntheonbioal ssLbilbedel bleed i leoud sal diet is inadequate. All evidence indicates, however, that this turnover and dynamic equilibrium is not uniform for the whole bone structure. The chief source of mobilizable calcium is in the organic matrix and the bone trabeculae. The older mineralized bone, which forms the bulk of the bone 0 Qo ! 2 3 Months By permission from The Physiological Basis of Medical Practice, by C. H. Best and N. B. Taylor. nearer rs Fig. 5—Increasein calcium of human fetus (from Hess after Schmitz) (Ref. 2) Strontium (mg 40