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dc.contributor.authorSilvani, Maria Ines-
dc.contributor.authorAlmeida, Gevaldo Lisboa de-
dc.contributor.authorFurieri, Rosanne Cefaly de Aranda-
dc.publisherInstituto de Engenharia Nuclearpt_BR
dc.subjectThernal neutrons tomographypt_BR
dc.subjectPosition sensitive detectorpt_BR
dc.subjectNon-destructive assaypt_BR
dc.titleComparison of tomagraphic systems for X-rays and thermal neutronspt_BR
dc.description.resumoIn this work tomographic images of the very same object have been taken with 25 keV X-rays neutrons (E=0.025 eV) aiming to demonstrate that a thermal neutron tomography in some cases is a complementary technique to the X-ray tomography, such as in the examination of hydrogen-bearing compounds contained in a metalic matrix for instance. The capability of the neutron to pass through metallic materials si=uch as lead, stainess steel and aluminium, allows the detection of encapsulated plastic explosives and visualize their inner structure like density variations, voids and alien materials, which are important features for the quality control of the final product. To obtain the images, a 3rd generation tomographic system equipped with an 8-cm long carbon window, and the detecotr filled with AR CH4 under 2 atm-pressure. The X-ray beam was supplied by an ampoule with a tungsten anode manufactured by gas replaced by 3He-enriched helium, acting simultaneously as neutron source fumished the 4,5 x 105 s-1 thermal neutron beam at is main channel exit, where the tomographic system was installed.pt_BR
dc.creator.affiliationInstituto de Engenharia Nuclear-
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