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Dosimeter gamma radiation household "Quartz DRGB-90" since 1992 produced Kyshtym radio plant. Designed to measure the equivalent (exposure) dose of photon ionizing radiation and is used for individual operational control of the radiation situation in residential and work premises, as well as on the ground. The device provides: sound and light indication of the registered radiation; light signaling the excess level of the equivalent external radiation dose level of 29 μSv / h (2900 μR / h); measure the photon dose rate. Technical characteristics: Measurement range of equivalent dose rate, μR / h - 10 ... 300, exposure dose rate, μR / h - 100 ... 3000. The main relative error of dose rate measurement in the range of 0 ... 30 μSv / h is ± 40%. The energy range of the recorded radiation, MEV - 0.06 ... 1.25. The time for establishing the operating mode is 15 s. Measurement time - 60 s. Supply voltage 4.5 V. Overall dimensions - 148x72x31 mm.