1984 Volume 33 Issue 6 Pages 343-349
Physical parameters on the exposure indoors from cosmic ray muons were determined in order to undertake computer simulations. The hitherto known information was compiled, and the unknowns were newly calculated. Assumptions and approximations required in making a practical model were also described. The stopping power and the range of muons in a normal concrete as well as the air were calculated for the energy up to hundreds GeV. The consistency of those results with ready-made tables was found satisfactory although the comparisons were available only in the low energy tail. The scattering effect of cosmic ray muons in building's interior was examined numerically through very simple model calculations. It was revealed that the overall scattering effect would be ignorable unless very small variations are wanted. The iron fraction in a reinforced concrete as well as the density of the concrete was also shown to be an ineffective factor.