. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. Fig. 1. Phosphorus-32 absorption by the tibia of an adult rat 5 minutes after intravenous injection (left) and 120 minutes after intravenous injection (light). ( X 3) [Photos courtesy of C. P. Leblond this exchange process nearly completely after a short time. Autoradio- graphs taken bj^ Leblond and co-workers (9) illustrate clearly that radioactive phosphate is absorbed by the epiphysial plate of the adult rat 5 minutes after injection (compare Fig. 1). After 2 hours, the absorp- tion is very distinct. It follows from
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. Fig. 1. Phosphorus-32 absorption by the tibia of an adult rat 5 minutes after intravenous injection (left) and 120 minutes after intravenous injection (light). ( X 3) [Photos courtesy of C. P. Leblond this exchange process nearly completely after a short time. Autoradio- graphs taken bj^ Leblond and co-workers (9) illustrate clearly that radioactive phosphate is absorbed by the epiphysial plate of the adult rat 5 minutes after injection (compare Fig. 1). After 2 hours, the absorp- tion is very distinct. It follows from the classical investigations of Paneth (10) that the ions in the topmost molecular layer fraction of a crystal powder enter into an exchange equilibrium with the ions of a surrounding solution. This statement holds only for a part of the ions which are located in the topmost molecular la^^er of a well-developed crystal surface — of a mine- ral, for example. Even if only a small of the topmost molecular layer of the bone apatite took part in the exchange proceedings, it would be sufficient for the removal of an important part of the phosphorus-32 from the plasma which was added to the blood fluid. Three percent of the bone phosphate, or maybe even more, settles in the topmost molecular layer of the bone apatite, and the phosphorus content of the latter is about 700 times greater than that of the blood plasma. If after a while. 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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