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From Particle-Production Cross Sections to KERMA and Absorbed Dose for the Case 96 MeV n-12C Interactions
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)Alternative title
Från partikelproduktionstvärsnitt till KERMA och absorberad dos för fallet 96 MeV n-12C växelverkningar (Swedish)
Abstract [en]

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.

Double-differential cross sections of inclusive charged-particle production are compared with recent calculations from models based on the GNASH code including direct, preequilibrium and compound processes. For protons, the shapes of the cross-section spectra are reasonably well described by the calculations. For the other particles- d, t, 3He and α- there are important discrepancies, in particular for 3He-ions and α-particles, concerning both shape and magnitude of the spectra.

Using the new cross sections, partial as well as total KERMA coefficients have been determined. The coefficients have also been compared to previous experimental results and model calculations. The p, d and t KERMA coefficients are in good agreement with those from a previous measurement. For the helium isotopes, there are no previous measurements at this energy. The KERMA coefficients are considerably higher (by up to 30%) than those predicted by the calculations.

The KERMA results indicate that protons and α -particles are the main contributors to the dose. A 6x6x6 cm3 carbon phantom, exposed to a broad and a pencil-like beam, is used for the computation of the absorbed doses deposited by these two particles in spheres of 1 μm in diameter, located at various positions in the phantom. The maximum doses are deposited at ~3 cm from the surface of neutron impact for protons and within 1 cm for α-particles. For the pencil beam, deposited doses are spread over regions of ~1.5 cm and ~300 μm transverse to the beam for protons and α-particles, respectively. The results are consistent with previous integral measurements at lower energies.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2004. , p. 68
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1049
Keywords [en]
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
Keywords [sv]
Kärnfysik
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-4700ISBN: 91-554-6115-8 (print)OAI: oai:DiVA.org:uu-4700DiVA, id: diva2:165543
Public defence
2004-12-07, Häggsalen, Ångströmlaboratoriet, Uppsala, 13:15
Opponent
Supervisors
Available from: 2004-11-15 Created: 2004-11-15Bibliographically approved
List of papers
1. A facility for measurements of nuclear cross sections for fast neutron cancer therapy
Open this publication in new window or tab >>A facility for measurements of nuclear cross sections for fast neutron cancer therapy
2000 In: Nucl. Instr. Meth., Vol. A 452, no 484Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92453 (URN)
Available from: 2004-11-15 Created: 2004-11-15Bibliographically approved
2. Cross section data and KERMA Coefficients at 95 MeV Neutrons for Medical Applications
Open this publication in new window or tab >>Cross section data and KERMA Coefficients at 95 MeV Neutrons for Medical Applications
Show others...
2002 In: J. Nucl. Sci. Technol., Vol. 2, no 1298Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92454 (URN)
Available from: 2004-11-15 Created: 2004-11-15Bibliographically approved
3. Neutron-induced Light Charged Particle Production in Carbon at 96 MeV
Open this publication in new window or tab >>Neutron-induced Light Charged Particle Production in Carbon at 96 MeV
Show others...
2004 In: Nucl.~Phys. A, Vol. AArticle in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92455 (URN)
Available from: 2004-11-15 Created: 2004-11-15Bibliographically approved
4. Experimental KERMA coefficients for carbon deduced from microscopic cross sections at 96 MeV incident neutron energy
Open this publication in new window or tab >>Experimental KERMA coefficients for carbon deduced from microscopic cross sections at 96 MeV incident neutron energy
2004 In: Phys. Med. Biol., no 49, p. 4523-Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92456 (URN)
Available from: 2004-11-15 Created: 2004-11-15Bibliographically approved
5. Dose from integral and microscopic cross sections measurements for 96 MeV n-12C interactions
Open this publication in new window or tab >>Dose from integral and microscopic cross sections measurements for 96 MeV n-12C interactions
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-92457 (URN)
Available from: 2004-11-15 Created: 2004-11-15 Last updated: 2010-01-13Bibliographically approved

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