Pilot study of 222Rn and 226Ra activity concentrations in groundwaters of Roztocze region, PolandAgata Kowalska, Elżbieta Domin and Tadeusz A. PrzylibskiE3S Web Conf., 44 (2018) 00077DOI: https://doi.org/10.1051/e3sconf/20184400077