Improvement of radiotracers experiments in mass transfer processes Leszek Petryka, Volodymyr Mosorov, Marcin Zych, Robert Hanus, Jerzy Sobota, Marek Jaszczur and Dariusz Świsulski EPJ Web Conf., 143 (2017) 02092 Published online: 12 May 2017 DOI: 10.1051/epjconf/201714302092