Adaptive tree multigrids and simplified spherical harmonics approximation in deterministic neutral and charged particle transport: Dissertation

    Research output: ThesisDissertation

    2 Citations (Scopus)

    Abstract

    A new deterministic three-dimensional neutral and charged particle transport code, MultiTrans, has been developed. In the novel approach, the adaptive tree multigrid technique is used in conjunction with simplified spherical harmonics approximation of the Boltzmann transport equation. The development of the new radiation transport code started in the framework of the Finnish boron neutron capture therapy (BNCT) project. Since the application of the MultiTrans code to BNCT dose planning problems, the testing and development of the MultiTrans code has continued in conventional radiotherapy and reactor physics applications. In this thesis, an overview of different numerical radiation transport methods is first given. Special features of the simplified spherical harmonics method and the adaptive tree multigrid technique are then reviewed. The usefulness of the new MultiTrans code has been indicated by verifying and validating the code performance for different types of neutral and charged particle transport problems, reported in separate publications.

    Original languageEnglish
    QualificationDoctor Degree
    Awarding Institution
    • University of Helsinki
    Supervisors/Advisors
    • Hiismäki, Pekka, Supervisor, External person
    • Savolainen, Sauli, Supervisor, External person
    Award date9 Jun 2007
    Publisher
    Print ISBNs978-951-38-7016-4
    Electronic ISBNs978-951-38-7017-1
    Publication statusPublished - 1 Dec 2007
    MoE publication typeG5 Doctoral dissertation (article)

    Keywords

    • BNCT
    • Boron neutron capture therapy
    • MultiTrans
    • Particle transport
    • Radiation transport
    • Radiotherapy
    • Reactor physics
    • Simplified spherical harmonics
    • Tree multigrid

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