Possibilities of radioisotope measuring in control of an unstable solid particles hydrotransport Leszek Petryka, Marcin Zych, Robert Hanus, Jerzy Sobota, Pavel Vlasak, Monika Śleziak and Dariusz Świsulski EPJ Web of Conferences, 114 (2016) 02093 Published online: 28 March 2016 DOI: 10.1051/epjconf/201611402093