Search for dissertations about: "fast-neutrons"

Showing result 1 - 5 of 12 swedish dissertations containing the word fast-neutrons.

  1. 1. Determination of absorbed dose in fields of fast neutrons

    Author : Anders Montelius; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Neutron dosimetry; finite volumes; interface effects; marrow dose; chord length distributions;

    Abstract : Analytical models have been developed to solve energy deposition problems in finite detectors and near interfaces in beams of fast neutrons. Dose expressions have been derived, which are suitable for numerical evaluation. The detectors or volumes of interest have been characterized by distributions of chord length along which the particles travel. READ MORE

  2. 2. From Particle-Production Cross Sections to KERMA and Absorbed Dose for the Case 96 MeV n-12C Interactions

    Author : Bel E. Bergenwall; Ayşe Ataç; Eva Lund; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; Fast neutrons; En = 96 MeV; charged-particle production; 12C n; px ; 12C n; dx ; 12C n; tx ; 12C n; 3Hex ; 12C n; ax reactions; cross sections; KERMA; microscopic measurements; absorbed dose; Kärnfysik; Nuclear physics; Kärnfysik;

    Abstract : Neutron-carbon interactions have been studied with a focus on charged-particle production of relevance to radiation protection and medical applications, such as cancer therapy. The measurements have been performed using the particle-detection setup, MEDLEY, and the 96 MeV neutron beam at the The Svedberg Laboratory in Uppsala. READ MORE

  3. 3. Neutron Irradiation Techniques

    Author : Julius Scherzinger; Kärnfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; actinide Be; fast-neutrons; NE-213 liquid scintillator; He-4 scintillators; pulse-shape discrimination; Cf-252; absolute detection efficiency; neutron irradiation; Fysicumarkivet A:2016:Scherzinger;

    Abstract : The He-3 “crisis” has become a fact in the last decade and large scale neutron detectors based on He-3 technologies have become unaffordable. This new He-3 reality has resulted in a major effort worldwide to develop replacement neutron-detector technologies. READ MORE

  4. 4. Optimization of Equipment for Tomographic Measurements of Void Distributions using Fast Neutrons

    Author : Peter Andersson; Staffan Jacobsson Svärd; Henrik Sjöstrand; Ane Håkansson; Michael Österlund; Stephan Pomp; Rudi Van Nieuwenhove; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Physics; Fysik;

    Abstract : This licentiate thesis describes a novel nondestructive measuring technique for determiningspatial distributions of two-phase water flows. In Boiling Water Reactors, which compose themajority of the world's commercial nuclear reactors, this so called void distribution is of importance for safe operation. READ MORE

  5. 5. Fast neutron dosimetry : a study of basic dosimetric properties of fast-neutrons for external beam radiotherapy and problems associated with corrections of measured charged particle cross-sections

    Author : Jonas Söderberg; Lennart Lindborg; Linköpings universitet; []
    Keywords : MEDICINE; MEDICIN;

    Abstract : Basic dosimetric properties of fast-neutron beams with energies ≤80 MeV were explored using Monte Carlo techniques. Elementary pencil-beam dose distributions taking into account transport of all relevant types of released charged particles (protons, deuterons, tritons, 3He and a particles) were calculated and used to derive several absorbed dose distributions. READ MORE