### Abstract

The plane, one-dimensional photon transport equation is considered in the case of two adjacent media, where one medium contains the Y-ray sources and the other is inactive. Assuming that the sources have a composite line spectrum, and that they are uniformly distributed, an explicit solution is given for the uncollided flux component. The scattered component is evaluated on the basis of the double-P. approximation, involving separate treatments of the upstreaming and the downstreaming flux, and a numerical method for solution of the corresponding equations is presented. The computational method permits determination of the differential and angular energy flux throughout the inactive medium. Formulas for obtaining integral field quantities (scalar energy flux, scalar number flux, and absorbed dose rate) are given. The flux calculation method is used in conjunction with a data processing system for evaluation of terrestrial gamma-radiation fields. A detailed description is given of both the datafiles and the programs of which the system consists. To illustrate the

performance of the system, results obtained for the radiation field in water

above sand are presented

performance of the system, results obtained for the radiation field in water

above sand are presented

Original language | English |
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Place of Publication | Roskilde, Denmark |
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Publisher | Risø National Laboratory |

Number of pages | 88 |

ISBN (Print) | 8755002994 |

Publication status | Published - 1974 |

Series | Denmark. Forskningscenter Risoe. Risoe-R |
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Number | 303 |

ISSN | 0106-2840 |

### Keywords

- Risø-R-303
- Risø-303
- Risø report 303

## Cite this

Kirkegaard, P., & Løvborg, L. (1974).

*Computer modelling of terrestrial gamma-radiation fields*. Risø National Laboratory. Denmark. Forskningscenter Risoe. Risoe-R, No. 303