| Abstrakt: |
Depression of the general arterial blood pressure by radiant energy has been repeatedly demonstrated, although a rise in pressure, during or soon after irradiation, has also been recorded. We have investigated the effects of known amounts of carbon arc radiation on the blood pressure, pulse rate and body temperature of normal adult dogs under standard conditions. A total of 13 experiments on 8 dogs have been completed, 11 with the Majestic Arc, and two with the Pan Ray Arc∗as the source of energy. The distribution of the energy irradiated by the two lamps, as determined spectroradiometrically†is approximately, for the Majestic Lamp or “Solarite”: ultra-violet 21.9 p. c., visible 43.5 p. c., infra red 34.6 p. c., and for the Pan Ray Arc 15, 59 and 26 per cent, respectively. The total energy of the “Pan Ray Arc” is about 6 times that of the Majestic, being equal to 1 gm. cal. per sq. cm. per minute at 103 cm.In the experiments with the Majestic Arc the animals were irradiated daily for 1 hour, either on the back or the abdomen, at a distance of 40 cm. from the lamp for periods of from 8 to 33 days. Each dose had a total energy equivalent to 55.44 gm. cal. per sq. cm. In 2 experiments the time of the exposures was increased to 2 hours daily for 8 days. In the first experinaent with the Pan Ray Arc, the abdomen of the animal was irradiated for 45 minutes at 1 meter (45.0 gm. cal. per q. cm.) and the dosage progressively increasedduring a period of 13 daily exposures. In the second experiment, the animal was exposed to massive abdominal exposures at intervals of 2 or more days. |
