Methods, systems, devices, and products for estimating at least one parameter of interest of a volume of an earth formation, including density, porosity, and fluid saturation of the volume. Methods may include normalizing radiation information relating to radiation emissions from a spatially distributed nuclear source and indicative of a property of the earth volume using a correction factor determined using an estimated lithology of the volume. The nuclear source may be in the volume. Radiation emissions may be generated by neutron irradiation of at least one nuclide in the volume. The correction factor may be determined using any of nuclear density of the at least one nuclide; an estimated concentration of the at least one nuclide in the volume; or a parameter relating to concentration of the nuclide in the volume. The emissions may include gamma rays.