Av. concns. of Rn-222 in a flowing gas as well as dose rate of gamma radiation emitted by selected elements of pipeline and background in 8 transmission line locations were detd. Furthermore, ay. concns. of Pb-210 were detd. in a dust from used filters. Av. concns. of Rn-222 and Pb-210 changed in ranges 30-1400 Bq/m(3) and 250-16700 Bq/kg, resp. Measured doses of gamma radiation emitted by selected elements of a gas pipeline.