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The dosimeter of the IRI-1 radio designer (Trio) has been produced since 1990 by the Baltiets software in Narva. The RC contains a complete kit for assembling an individual radiation indicator. The assembled device is designed to assess the background radiation in the range from 10 to 120 μR / H. It allows to assess the level of pollution by gamma radiation of food and feed from 3,700 Bq / kg (Bq / l) in areas with a natural radiation background and contaminated with long-lived nuclides, as well as in places where ROO is located. Gamma - radiation is recorded with an audible alarm and a pointer instrument with a scale divided into three color sectors. If the arrow is in the green sector of the scale (gamma radiation dose rate from 0 to 60 μR / h), this means that the power is within the background value; if in the yellow sector - "Attention" (dose rate from 60 to 120 μR / H); in red - "Dangerous" (dose rate more than 120 μR / h). Power supply 4 batteries DO-0,6 or 2 sources ML-2325. When registering the natural background of a set of power sources, it lasts for 60 hours of continuous work. Mass of the device 250 gr.