J.C. Ryman, K.F. Eckerman, J.K. Shultis and R.E. Faw, "Application of Discrete Ordinates and Monte Carlo Methods to Transport of Photons from Environmental Sources," Proc. 1996 Shielding Topical Meeting, Advances and Applications in Radiation Protection and Shielding, Vol. 1, American Nuclear Society, LaGrange Park, Illinois, April, 1996.

Federal Guidance Report No. 12 tabulates dose coefficients for external exposure to photons and electrons emitted by radionuclides distributed in air, water, and soil. Although the dose coefficients of this report are based on previously developed dosimetric methodologies, they are derived from new, detailed calculations of the energy and angular distributions of the radiation incident upon the body and the transport of these radiations within the body. Particular effort was devoted to expanding the information available for the assessment of radiation dose from radionuclides distributed on or below the surface of the ground. A companion paper ("External Exposure to Radionuclides in Air, Water, and Soil") discusses the significance of the new tabulations of coefficients and provides detailed comparisons to previously published values. This paper discusses the details of the photon transport calculations.

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