. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. lOmin. Fig. 1. Exhalation of i^COg of x-rayed (0) and control (O) mice after intraperito- neal injection of NaHi^COg. Values for the determina- tions of "COg in the interval 0—2 minutes are plotted at 1 minute, etc. lOmin. Fig. 2. Exhalation of "cOg of x-rayed (^) and control (O) niice after intravenous injection of NaHi^COg. Less activity than in the intra- peritoneal experiments was injected. of the injected ^^COg is exhaled, the controls gave off more ^^CO, (45%) than the irradiated animals (29%), and more
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. lOmin. Fig. 1. Exhalation of i^COg of x-rayed (0) and control (O) mice after intraperito- neal injection of NaHi^COg. Values for the determina- tions of "COg in the interval 0—2 minutes are plotted at 1 minute, etc. lOmin. Fig. 2. Exhalation of "cOg of x-rayed (^) and control (O) niice after intravenous injection of NaHi^COg. Less activity than in the intra- peritoneal experiments was injected. of the injected ^^COg is exhaled, the controls gave off more ^^CO, (45%) than the irradiated animals (29%), and more ^^COg was retained in the exposed animals which gave off more ^^COg in the later stage of the expe- riment. Between 4 and 10 minutes 46% was given off by the irradiated animals against 34% by the controls. The aggregate amount of "COg exhaled during the first 10 minutes by the two groups of mice is by chance the same as seen in Table results are remarkablj^ repro- ducible. Evidently it would be expected that the activity expired by the irra- diated mice during the first minute ^^ ould be decreased even more from that of the control mice. In a few trials of this hypothesis the activity expired during the 1st minute, including the 6 seconds taken for the injection in these experiments, was found to be only 43% of that of the controls. This indicates that the X-ray effect on the process of resorp- tion of the bicarbonate and the intrusion of COg into the alveolar space is very 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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