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Price, C. An evaluation of lead foil in dental X-ray film packets. 1. Factors affecting the intensity of back-scattered radiation and the effect of this radiation on radiographic contrast when density is allowed to increase. Br Dent J 133, 300–304 (1972). https://doi.org/10.1038/sj.bdj.4802911
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DOI: https://doi.org/10.1038/sj.bdj.4802911