1. The Quantum Theory of Radiation;Heitler,1954
2. Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest;Hubbell,1995
3. Nat. Bur. Of Standards Handbook No. 55, Supr. of Doc., Washington, 25, D.C. Protection against Betatron-Synchrotron Radiations up to 100 Million Electron Volts;Koch,1954