“…Several different Monte Carlo-based particle transport simulation toolkits have previously been used for the investigation of secondary cosmic-ray neutrons at the soil-atmosphere interface in the context of CRNS including GEANT4 (Hubert et al, 2016;Brall et al, 2021), MCNP (Zreda et al, 2008;Franz et al, 2012;Andreasen et al, 2016Andreasen et al, , 2017Weimar et al, 2020;Köhli et al, 2021) and URANOS (Köhli et al, 2015(Köhli et al, , 2021Li et al, 2019;Rasche et al, 2021) which only simulates neutrons of different energies. Although simulating only neutrons and not e.g.…”