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Experimental investigation of filtered epithermal-photoneutron Beams for BNCT

By D.W. Nigg, H.E. Mitchell, Y.D. Harker and J.F. Harmon

Abstract

The Idaho National Engineering Laboratory (INEL) has been investigating the feasibility of a concept for an accelerator-based source of epithermal neutrons for BNCT that is based on the use of a two-stage photoneutron production process driven by an electron accelerator. In this concept, relativistic electron beams impinge upon heavily-shielded tungsten targets located at the outer radius of a small cylindrical tank of circulating heavy water (D{sub 2}0). A fraction of the energy of the electrons is converted in the tungsten targets into radially-inward-directed bremsstrahlung radiation. Neutrons subsequently generated by photodisintegration of deuterons in the D{sub 2}O within the tank are directed to the patient through a suitable beam tailoring system. Initial proof-of-principal tests using a low-current benchtop prototype of this concept have been conducted. Testing has included extensive measurements of the unfiltered photoneutron source as well as initial measurements of filtered epithermal-neutron spectra produced using two different advanced neutron filtering assemblies, as described here

Topics: Energy Resolution, Tungsten 186 Target, Epithermal Neutrons, Tungsten 184 Target, Tungsten 183 Target, Electron Beams, Linear Accelerators, Bremsstrahlung, 55 Biology And Medicine, Basic Studies, Photonuclear Reactions, 66 Physics, Photoproduction, Beam Production, Neutron Capture Therapy, Heavy Water, Photoneutrons, Neutron Beams, Tungsten 182 Target, Neutron Sources
Publisher: Idaho National Engineering Laboratory
Year: 1996
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Provided by: UNT Digital Library
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