Radioisotpe measurement of two-phase flow in pipeline using conditional averaging of signal

The paper illustrates use of the gamma-absorption method fortify with analysis based on conditional averaging of signals applied in an investigation of two-phase flows. An example of its application to the gaseous phase transported by a liquid in a horizontal pipeline was evaluated. In the measurements on laboratory installation two ²⁴¹Am radioactive sources and probes with NaI(Tl) scintillation crystals have been used. Exemplary results of the mean velocity determination of the minority phase in the examined flow are demonstrated, and the evaluation of its uncertainty has been presented. Results obtained by use of the both described method and cross-correlation one have been compared.