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The radiometer "SRP-1a" was produced presumably since 1960. The device is a highly sensitive radiometer with a scintillation counter and is designed to register gamma radiation. Used to search for deposits of radioactive elements in the pedestrian gamma survey, can be used when working with labeled atoms in various fields of science, technology and industry. The whole measurement range 10 ... 1250 micron / hour) is divided into 3 sub-ranges. With the help of a splined regulator, the upper limit of measurement can be extended to 2500 μR / hour. The threshold of sensitivity of the radiometer is 5 seconds, not more than 2 μR / hour with a gamma background level of 8 μR / hour. The radiometer is sensitive to gamma radiation with an energy above 50 keV and beta radiation with an energy above 2 Mei. Measurement error under normal conditions of temperature and humidity is no more than ± 10% of the reading and ± 2.5% of the scale. Operating temperature range from -20 to 40 °. The device is operable in conditions of relative humidity up to 98% with an additional error of no more than ± 10% of the reading. Food from 4 elements like 1-KS-Z. The power of the anode circuit of the lamp and the photomultiplier is carried out from the same sources with the help of voltage transducers on crystalline triodes. The stock of the power kit ensures the operation of the device for 50 hours. The weight of the instrument is about 4 kg.