I have a problem with units.... I have been looking at energy loss of muons in matter (from both ionizations and radition processes like bremsstrahlung). I have used an equation for the mean energy loss (for a muon of specified energy in a specified material) which gives an answer in units of g/cm^2/MeV. I am ok with converting this to cm/MeV I think (just divide by the density), but my problem is what does the 'per MeV' bit mean? I have 50GeV muons going into concrete and from what I have read the mean range is ~45m. The equation I am using gives me an answer of 6.58cm/MeV (or 16.44g/cm^2/MeV) and I'm puzzling over how this gets converted into 45m. Any help?