A computer program and data base are presented which can be used to calculate, with a personal computer, photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, in any element, compound or mixture, at energies from 1 keV to 100 GeV.A convenient alternative approach is to generate the cross sections and attenuation coefficients for compounds and mixtures as needed, using a personal computer. This paper describes a computer program called XCOM which carries out this task quickly on IBM-compatible personal computers, for any element, compound or mixture, at energies between 1 keV and 100 GeV. The program makes use of a database of cross sections for the elements that is stored in compressed form on a single floppy disk.The XCOM program can generate cross sections on a standard energy grid (spaced approximately logarithmically), or on a grid selected by the user,

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