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Beta-gamma radiometers DP-11-A and DP-11B have been produced since 1958 and 1959. Instruments are the same with a few exceptions. "DP-11B" improved "DP-11A". The measurement ranges of "DP-11-A" are 50 ... 600 000 rap / min * cm2 for beta radiation and 0.02 ... 30 mR / h for gamma radiation. The probe head has two turning shells in which slots are cut, which coincide with the slots of the inner cup in a fixed position. This position is used to measure small degrees of infection. The following describes the radiometer "DP-11B". Designed to measure the degree of contamination by beta-gamma substances of the surfaces of the soil, clothing and skin of people, the presence of radioactive substances in water samples, food, fodder. It is also used to measure the power of gamma radiation. It can be used for radiation reconnaissance of a locality with air. The device has a range of measurements of the degree of contamination of surfaces with beta-gamma-active substances 150 ... 1 million dec / min * cm2; The range of measurements of gamma radiation dose rates is 0.03 ... 20 mR / h. The weight of a set is 13.2 kg. The weight of the working set (remote, probe, telephones, belts) is 5.4 kg. The dimensions of the console are 260x115x175 mm, the probe length is 1 m. The preparation time of the device for operation is 3 minutes. Settling time of the instrument when measuring at 2 sub-ranges of 0.5 minutes; On 1 subrange 1 minute.