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RADIATION THRESHOLDS FOR CHORIORETINAL BURNS

机译：用于胆囊炎的辐射阈值

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Eyes of live rabbits were exposed to electromagnetic radiation of different spectral distributions to compare their effectiveness in producing chorioretinal burns when retinal image size and (in most cases) exposure time remained constant. The experiments were limited to the spectral range between 200 and 3000 m. A carbon Jet-arc served as radiation source in most cases. Results were differentiated for three groups of fundus pigmentation. It was found that ultraviolet is virtually ineffective. The effectiveness of the visible and infrared regions of the spectrum is considerably greater, and depends upon wavelength: the longer the wavelength the higher the energy threshold measured at the cornea. Present experimental data and related data published by other authors were used to infer a spectral effectiveness function for chorioretinal burns. A separate function is presented for threshold and for suprathreshold burns. The data of this and related experi¬ments are used to derive relations between burn diameter, exposure duration, and burn threshold. A calculational method is described which permits calculation of whether or not a burn is to be expected, based upon physical data on the source such as intensity, size, distance, duration, and spectral composition.

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