| 摘要 |
Means for contrastingly projecting X-rays for identification purposes upon an X-ray film carried by a cassette include, at the front face of the cassette (the side facing the radiation source), an indicia sheet of X-ray opaque material form which a plurality of identifying characters have been punched out, and imperforate X-ray absorbent sheet material interposed between said indicia sheet and the radiation source for attenuating the radiation beam passing to said indicia sheet. The indicia sheet and the imperforate sheet material, which are arranged to be subjected to X-rays simultaneously with the imposing of such radiation upon the person or thing to be identified, may be varied in their relative opacities and in their cumulative opacity, depending upon the radiation strength and the X-ray absorption characteristic of the subject being photographed. Said indicia sheet and imperforate sheet material are advantageously separably associated with a suitable indicia carrier.
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