It is reported that natural background radiation and X-ray radiation for the baggage check in an airport affect the photographic properties of silver halide imaging materials. Since the mechanism of latent image formation for these ionizing radiations has not yet been established precisely, it was investigated here for 60{sup left}Co-γ ray and 80kVp X-ray with octahedral AgBr emulsions. As a result, the sensitivities to these ionizing radiations could be quantitatively predicted from their characteristic curves for visible-light.
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