FIELD: measurement technology. SUBSTANCE: enhanced reliability of radiometer is obtained by elimination of moving mechanical parts in means of forced pumping. Expanded functional capabilities of it are achieved by integration of functions of heating element in means of forced pumping of air with domestic functions, for instance, illumination of rooms. It can also measure radon, both its volumetric activity and concentration of its daughter products in air of examined room. This problem can be solved due to use of heating element installed in channel as means of air pumping. Channel is manufactured for its mounting under measurement mode at angle alpha to horizon, where alpha is chosen from condition: alpha is not equal to zero. EFFECT: enhanced reliability and expanded functional capabilities of radiometer. 1 dwg, 1 tbl
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