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Radiometers "DP-3B" and "DP-3A-1" were produced presumably since 1985. Radiometer "DP-3B" is designed to measure the levels of gamma - radiation on the ground. Installed on cars, airplanes, helicopters, diesel locomotives, river boats. The measurement range from 0.1 to 500 p / h is divided into 4 subranges. Power supply with a constant voltage of 12 or 26 volts. Preparation time for work 5 min. X-ray mass 4.4 kg. The radiometer "DP-3A-1" is a modification of the main device and, apart from the attachment and desoldering of external circuits, does not differ from it.