1. XCOM: Photon cross sections on a personal computer;Berger,1987
2. Photon attenuation coefficient study of some materials containing hydrogen, carbon and oxygen;El-Kateb;Appl. Radiat. Isot.,1991
3. The effective atomic numbers of the materials for various gamma ray interactions;Hine;Phy. Rev.,1952
4. Determination of electronic density and average atomic number of tissues in man by gamma ray attenuation;Joyet;Experientia,1974
5. Effective atomic numbers in alloys for incoherent scattering of gamma rays;Khayyoom;Ind. J. Pure Appl. Phys.,1970