FIELD: measurement technology. SUBSTANCE: device measuring composition of fluid flowing through pressure pipe-line includes pipe-line so manufactured for connection to pressure pipe- line that flow of fluid passes through pipe-line, radioactive source so positioned that its radiation passes through flow of fluid and wall of pipe-line, detector detecting radiation passing through flow and wall and facility generating signal corresponding to radiation detected by detector. Wall of pipe-line is made from resin reinforced by fibers. Detector presents solid detector cooled by Peltier's element. Detector has two surfaces detecting radiation, one being closed by filter. Filter retains low-energy radiation and lets high-energy radiation pass. EFFECT: development of compact device enabling precise measurement to be obtained. 12 cl, 2 dwg
