A system for the determination of silicon in the human lung using neutrons from A 2MV Van de Graaff generator |
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Authors: | A Kacperek C J Evans J Dutton W D Morgan A Sivyer |
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Institution: | (1) Department of Physics, University College of Swansea, University of Wales, Singleton Park, SA2 8PP Swansea, (UK);(2) Department of Medical Physics and Clinical Engineering, Singleton Hospital, SA2 8QA Swansea, (UK) |
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Abstract: | Neutron activation analysis, using inelastic scattering, provides a quantitative, non-invasive technique of studying silica burdens and is potentially useful as a screening procedure for occupationally exposed workers. In this method, silicon is measured using the fast neutron inelastic scattering reaction28Si(n,n )28Si which emits 1779 keV -rays. The method requires a source of fast neutrons (> 2MeV). A 2MV Van de Graaff generator has been developed to produce a pulsed beam of 5.2 MeV neutrons. The pulsed beam has the advantage of improving measurement sensitivity by separating in Bone the inelastic scattering -rays from those due to thermal-neutron capture reactions. The incident neutron energy was chosen to maximise the silicon -ray count rate, while keeping the signal from the competing reaction31P(n, )28Al negligible. |
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