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The radiometer "DP-1-A" was produced presumably since 1953. This is a field portable dosimetric device intended for conducting radiation reconnaissance. It allows you to measure the levels (dose rates) of gamma radiation, as well as to estimate the levels of beta radiation in areas contaminated with radioactive substances. Basic tactical and technical data. A radiometer has a gamma radiation measurement range from 0.04 to 400 roentgens per hour. The range is divided into 4 subranges: The measured levels are measured by a microammeter, the scale of which is calibrated in units of dose rate (X-ray / hour). The accuracy of the device when measuring ± 30% in the scale section from 0 to 0.1 and ± 20% in the scale section from 0.1 to 0.4 for all subranges. The power of the radiometer is carried out from a single element 1.6-PMC-8; one 13-AMTSG-0.5 battery and three 105-PMGG-0.05 batteries. One set of power supplies ensures continuous operation of the device for 50 ... 60 hours. The roentgenometer (set) weight is 6.7 kg.