Evaluation of a computer aided neutron tomographic system incorporating a gaseous position sensitive detector

• Autor(a) principal: Silviani, Maria Ines
• Data de Publicação: 2002
• Outros Autores: Lopes, Ricardo T., Jesus, Edgar F. Oliveira, Ameida, Gevaldo L. de, Barbosa, Ademarlaudo F., Instituto de Engenharia Nuclear
• Tipo de documento: Relatório
• Idioma: eng
• Título da fonte: Repositório Institucional do IEN
• Texto Completo: http://carpedien.ien.gov.br:8080/handle/ien/2207
• topic: Computed tomography; Thermal neutrons; Position sensitive detector

A position sensitive gaseous detector, formerly designed to operate with X-rays, has been modified to equip a 3rd generations tomographic system working with a parallel termal neutron beam. For this purpose, the original filling-gas and converter of neutrons into charged particles. 3He is an attractive choice for thermal neutron detection because and a good charge amplification factor. This paper describes the modifications done to the detector, the measurements carried out to evaluate its own performance and that of the tomographic system equipped with to it. Some tomographic images acquire using that system are presented as well. Tomographic systems equipped with this kind of detector should require substantially much less time than those conventional ones, where a sample translation is required. The Argonauta reactor operating at the Instituto de Engenharia Nuclear (IEN/CNEN-Brazil) has been utilized as the source of neutrons, furnishing a flux 4.5x105 n.cm-2 .s-1 at its main irradiation channel where the tomographic system has been placed.