Modelling seasonal variations of natural radionuclides in agricultural soils I. Guagliardi, G. Buttafuoco, N. Ricca, M. G. Cipriani, D. Civitelli, R. Froio, A. L. Gabriele and R. De Rosa E3S Web of Conferences, 1 (2013) 08009 Published online: 23 April 2013 DOI: 10.1051/e3sconf/20130108009