X-Ray Build-Up Factors.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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This report is a compilation of time integrated x-ray energy build-up factors from a monoenergetic point source in infinite homogeneous air. These factors were computed by the use of PHOTDIS, a moments method computer code, and performed on a CDC 6600. This code was chosen after a literature search and a review of many computer models. Energies from 12 keV to 1000 keV and ranges from 1 mean-free-path are considered. All results are presented on semi-log graphs with each graph containing one energy. This program is estimated to have an error of at most 20 percent. The results are compared to Monte Carlo and Discrete Ordinates calculations. Even though the moments calculations do not completely agree with any of the Monte Carlo calculations, the moments calculation agree with the average of the Monte Carlo calculations. A complete derivation of the moments method from the Boltzmann Transport Equation is also included. Author
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