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Abstract
The method of electric flicker which is serviceable for measuring the effect of oxygen lack and fatigue was shown to be useful for detection of the effect of a small dose of Roentgen rays, too. 1. The threshold value of Roentgen rays to produce a noticeable increase of the electric flicker value was within a range from 0.1 to 0.4 r. 2. The effect of a Roentgen irradiation appeared with a latency of a few minutes, and attained a maximum in about 20-30 minutes to dis-appear in about 50 minutes. 3. As no sensation of light was elicited by such a small dose of Roentgen rays in a light-adapted state of the retina, the phenomenon under consideration is not a secondary effect of visual excitation. 4. When any other parts of the body were exposed to Roentgen rays of higher doses, a very slight effect, if any, could be observed, and this effect could be accounted for in terms of the direct effect of scattered Roentgen rays upon the eyes.
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