The CSDA range for protons in aluminum (in units of mass thickness g/cm2) are 2.953×10−4, 4.020×10−3, and 0.1692 for protons with energies of 0.1 MeV, 1 Mev, and 10 MeV, respectively [Janni 1982]. Use the empirical Eq. (7.47) to estimate these ranges and compute the percent difference. 21. Shultis, J. Kenneth; Faw, Richard E.. Fundamentals of Nuclear Science and Engineering (p. 220). CRC Press. Kindle Edition.