22 September 1999 X- and gamma-ray tomography for nondestructive material testing
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Abstract
Various apparatus for x and (gamma) -ray computed tomography (CT) have been constructed by us during the last 20 years, with the aim of producing simple and low-cost systems for nondestructive testing. The first one was constructed in 1980 and used an Am241 radioactive source emitting 59.6 keV (gamma) -rays and a single NaI(Tl)-x ray detector. Successively, the radioactive source was substituted during the years by x-ray tubes, and the single detector by multi- detection system such as arrays of detectors and image intensifiers. The last CT-scanner employs a 160 kV x-ray tube and a 6' X 6' image intensifier coupled through a lens to a cooled CCD-camera. At the same time, also (gamma) CT-scanners were constructed for large size and/or high-density samples. These are based on Ir192 or Cs137 radioactive sources coupled to a single NaI(Tl)(gamma) -ray detector. The characteristics and properties of the CT-scanners based on the use of x-ray tubes, emitting x-rays in the energy range 20 - 100 keV, and on (gamma) emitting radioisotopes (Ir192 and Cs137) have been studied and will be described in this paper. Various types of objects have been studied: test objects and common objects such as tree trunks, wood fragments, nuts, ceramic samples, insulators and, etc. Samples have been imaged, after using iodine compounds as tracers.
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Roberto Cesareo, Antonio Brunetti, Ricardo Tadeu Lopes, Gianfranco Galli, Donepudi V. Rao, Alfredo Castellano, Giovanni E. Gigante, Sergio Mascarenhas, Rene Robert, Vitoldo Swinka Filho, Marco Gilardoni, Hamilton Pereira Da Silva, Piero Quarta Colosso, "X- and gamma-ray tomography for nondestructive material testing", Proc. SPIE 3772, Developments in X-Ray Tomography II, (22 September 1999); doi: 10.1117/12.363732; https://doi.org/10.1117/12.363732
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