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X-ray meters "DP-1-B" and "DP-1-B" were produced, respectively, since 1954 and 1956. Virtually no different from each other. Designed to measure the levels of gamma radiation in the exploration of infected areas and to detect beta radiation. The measurement range is 0.02 ... 400 R / h, divided into 4 sub-bands. The device is powered by a 100-PMTSG-0.05 battery, a 1.6-PMC-U-8 cell, and a 13-AMSTG-0.5 battery. A fresh set of power ensures the operation of the device for 50 hours.