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The dosimeter "DRG-01T1" was produced presumably since 1992. It is intended for measuring the equivalent dose rate of gamma radiation and X-ray radiation power at workplaces, in adjacent premises and on the territory of enterprises using radioactive substances and other sources of ionizing radiation, in the sanitary protection zone and observation zone. The body of the dosimeter is made of metal, equipped with a liquid crystal display and backlight. Technical parameters: Energy range of the dosimeter: from 0.05 to 3.0 MeV. Measurement limits for DER in the "search" mode: from 0.1 mR / h to 99.99 R / h; in the "measurement" mode: 0.01mR / h ... 9.99R / h. Speed: 2.5 s ("search" mode); 25c (measurement mode). Power, power consumption: element "Corundum" (crown, 9V). The time of continuous operation without changing the battery is at least 24 hours. Operating conditions: -10 ... 40 ° C; humidity up to 90% at 30 ° C. The overall dimensions of the dosimeter are 166x88x48 mm. Its weight is about 0.5 kg.