. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. 182 ADVENTURES IX RADIOISOTOPE RESEARCH Tablp: 15. Labelled i' foiiiid Labelled P found in 1 mgm fresh in 1 mgm ash Loss in Org;in tissue as a per- as a percentage weight on centage of the of the amount ignition amount given given Incisor Molar Jaw Tibia head Tibia residue out in 5 pieces the labelled P content of which is seen below, I denoting the proximal end. Table 16. Weight of the fresh tissue in mgm I II III IV V
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. 182 ADVENTURES IX RADIOISOTOPE RESEARCH Tablp: 15. Labelled i' foiiiid Labelled P found in 1 mgm fresh in 1 mgm ash Loss in Org;in tissue as a per- as a percentage weight on centage of the of the amount ignition amount given given Incisor Molar Jaw Tibia head Tibia residue out in 5 pieces the labelled P content of which is seen below, I denoting the proximal end. Table 16. Weight of the fresh tissue in mgm I II III IV V Labelled V found in 1 mgm fresh tissue as a per- centage of the amount given. 0 0 One cc. of blood contained of the activity injected; assuming a blood content of 10 cc, only 5% of the labelled phosphorus injected was present in the circulation after the lapse of 1 hour. Only 1 hour after administering the labelled phosphorus the tibia phosphorus was found to be 1000 times less active than the blood phosphorus, while for the molars the corresponding ratio was found to be 5000 and for the incisors (inclusive of growth) 2700. We also determined the activity of the acid soluble phosphorus extracted from the muscles of the rat and found 1 mgm to contain of the labelled P given. From this figure and those found for the activity of the tooth and tibia phosphorus 1o bo seen in Table 16 it follows that a comparatively fast phosphorus exchange is taking place in the muscle compared with that ascertained in Ihe l)ones and the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hevesy, Georg von, 1885-1966. New York, Pergamon Press
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