“…Another example of background modeling is presented in [20], where the terrestrial background spectrum expected from the three families of isotopes, 40 K, 232 Th and 235 U/ 238 U, measured with a HPGe detector in an open space location at a seaport is modelled using the Monte Caro N-Particle (MCNP) transport code [42]. In contrast with [25], this work manages to match with good agreement the simulation and measured spectra using simple scaling of each family of isotopes; only at energies below 400 keV the difference is about 30%, which the authors discovered is due to lack of accounting for the skyshine effect. Once the skyshine, cosmic and terrestrial gamma backgrounds are considered, the simulation of a NaI(Tl) detector spectra in [20] achieves an excellent match with data collected in an open field site.…”