Nuclear Particle Transport with Emphasis on Monte-Carlo and Shielding Calculations

P. Kirkegaard

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    A description is given of a number of methods of calculating the transport of neutrons and Y-rays, mainly in reactor shields. Emphasis has been laid on the Monte-Carlo technique. All the methods described have been programmed for the electronic computer GIER at Risø, and some of them also for the IBM 7090 computer at the Danish Technical University, Lyngby. A simple bulk shield programme system has been developed which calculates the penetration of neutrons as well as Y-rays throughout a reactor shield. The neutrons are treated according to the removal-diffusion theory with one removal and one diffusion group. The Y-ray calculation relies on the build-up concept. An improved removal-diffusion neutron shielding programme has been worked out, permitting an arbitrary number of removal and diffusion groups. A cross-section library with the elements most frequently encountered in shielding has been prepared. A general outline of the Monte-Carlo calculation method for problems
    in nuclear particle transport is given. Some minor reactor problems concerning
    self-absorption of Y-rays in fuel rods and distribution of the energy deposition on the various components of a fuel lattice cell are solved by the Monte-Carlo method. A Monte-Carlo Y-ray shielding programme has been written, especially
    suited for laminated shields, in which case it is superior to build-up methods. The programme calculates the energy deposition rate throughout the shield as well as the dose rate at the external surface. Finally, a Monte-Carlo method for computing the axial neutron flax distribution in a short, absorbing rod is presented. Whenever possible, the calculations described in this report have been supported by experimental results.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages110
    Publication statusPublished - 1966
    SeriesDenmark. Forskningscenter Risoe. Risoe-R


    • Risø-R-136
    • Risø-136
    • Risø report 136


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