### Abstract

The plane one-dimensional photon transport equation is solved for the scattered γ-radiation flux in the case of two adjacent media. One medium represents a natural ground with uniformly distributed potassium, uranium, and thorium γ-ray emitters. The other medium is air with no radioactive contaminants. The solution method is the double-P1 approximation with equidistant lethargy mesh. By this approach, which is discussed in some detail, it is possible to calculate the complete terrestrial γ-radiation field in an economical way. Calculated ground-level γ-ray exposure rates for igneous rocks with effective atomic numbers in the range 13.1 to 15.5 are presented.

Original language | English |
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Journal | Journal of Computational Physics |

Volume | 36 |

Issue number | 1 |

Pages (from-to) | 20-34 |

ISSN | 0021-9991 |

DOIs | |

Publication status | Published - 1980 |

## Cite this

Kirkegaard, P., & Løvborg, L. (1980). Transport of Terrestrial gamma-Radiation in Plane Semi-Infinite Geometry.

*Journal of Computational Physics*,*36*(1), 20-34. https://doi.org/10.1016/0021-9991(80)90172-2