Soil gas radon and thoron measurements in some Venezuelan oilfields. - Fernández, Daniel; Fusella, Emidio; Avila, Yininber; Salas, Jhonny; Teixeira, Diana; Fernández, Guillermo; Sajo-Bohus, Laszlo; Greaves, Eduardo; Barros, Haydn; Bolívar, Manuel; Regalado, Jimmy (Journal of Radioanalytical & Nuclear Chemistry, 2016)