Uranium, radium and thorium in soils with high-resolution gamma spectroscopy, MCNP-generated efficiencies, and VRF non-linear full-spectrum nuclide shape fittingRobert Metzger, Kenneth Van Riper and George LascheEPJ Web Conf., 153 (2017) 01001DOI: https://doi.org/10.1051/epjconf/201715301001