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Enclosed pass-throughs designed to exchange x-ray film cassettes to and from the darkroom without radiation light entering. These pass-throughs typically consist of metallic structures with a lead linen to provide x-ray shielding; they are typically wall mounted and include automated interlocks that close one door when the opposite is opened. X-ray enclosed pass-throughs are also used for temporary storage of loaded cassettes isolated from the radiation source.
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