Radioisotope measurements of the liquid-gas flow in the horizontal pipeline using phase method Robert Hanus, Marcin Zych, Marek Jaszczur, Leszek Petryka and Dariusz Świsulski EPJ Web Conf., 180 (2018) 02032 Published online: 04 June 2018 DOI: 10.1051/epjconf/201818002032