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Experimental kerma coefficients of biologically important materials at neutron energies below 75 MeV.

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Meulders, Jean-Pierre [UCL] Benck, Sylvie [UCL] Slypen, I. Corcalciuc, V.

The present work summarizes our results already published on cross sections and partial kerma coefficients for hydrogen, carbon, and oxygen and then applies them for determining experimental partial and total kerma coefficients of composite biologically important materials. Double-differential cross sections for light-charged particle production (proton, deuteron, triton, and alpha particle) induced by fast neutrons on hydrogen, carbon, and oxygen have been experimentally measured at several incident energies from 25 to 75 MeV. The measurements covered the laboratory angular range 20 degrees to 160 degrees and were extended to very forward and very backward angles by using a reliable extrapolation procedure. Energy-differential, angle-differential, and total production cross sections were derived from the measured data. The experimental methods and data reduction procedures are briefly presented here. The experimental cross sections were compared to existing data in the literature for nucleon-induced reactions and against prediction of nuclear models. Partial and total elemental kerma coefficients were deduced on the basis of the measured cross sections. Procedures for extrapolating the partial kerma coefficients down to the reaction threshold energies for each of the measured ejectile species have been applied to carbon and oxygen. A simple-to-use analytical formula to describe the experimental hydrogen kerma coefficients was proposed which provides the recoil kerma coefficients in the incident neutron energy range 0.3 to 100 MeV. The present article reports for the first time experimental partial kerma coefficients for composite materials of biological interest. Resulting total kerma coefficients are compared to theoretical predictions and to other experimental data.

Document type Article de périodique (Journal article) – Journal Article, Research Support, Non-U.S. Gov't
Publication date 2000
Journal information "Medical physics" - Vol. 27, no. 11, p. 2541-59 (2000)
Peer reviewed yes
issn 0094-2405
Publication status Publié
Affiliation UCL - SC/PHYS - Département de physique
MESH Subject Algorithms ; Carbon ; Cyclotrons ; Hydrogen ; Models, Statistical ; Neutrons ; Oxygen ; Plastics ; Radiotherapy - instrumentation ; Reference Values ; Water
Links
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Bibliographic reference Meulders, Jean-Pierre ; Benck, Sylvie ; Slypen, I. ; Corcalciuc, V.. Experimental kerma coefficients of biologically important materials at neutron energies below 75 MeV.. In: Medical physics, Vol. 27, no. 11, p. 2541-59 (2000)
Permanent URL http://hdl.handle.net/2078.1/8712