CARLOS HENRIQUE DE MESQUITA
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Artigo IPEN-doc 24773 Characteristics of the CsI:Tl scintillator crystal for X-Ray imaging applications2018 - PEREIRA, MARIA da C.C.; MADI FILHO, TUFIC; BERRETTA, JOSE R.; MESQUITA, CARLOS H. deScintillators are high-density luminescent materials that convert X-rays to visible light. Thallium doped cesium iodide (CsI:Tl) scintillation materials are widely used as converters for X-rays into visible light, with very high conversion efficiency of 64.000 optical photons/MeV. CsI:Tl crystals are commercially available, but, the possibility of developing these crystals into different geometric shapes, meeting the need for coupling the photosensor and reducing cost, makes this material very attractive for scientific research. The objective of this work was to study the feasibility of using radiation sensors, scintillators type, developed for use in imaging systems for X-rays. In this paper, the CsI:Tl scintillator crystal with nominal concentration of the 10−3 M was grown by the vertical Bridgman technique. The imaging performance of CsI:Tl scintillator was studied as a function of the design type and thickness, since it interferes with the light scattering and, hence, the detection efficiency plus final image resolution. The result of the diffraction X-ray analysis in the grown crystals was consistent with the pattern of a face-centered cubic (fcc) crystal structure. Slices 25 × 2 × 3 mm3 (length, thickness, height) of the crystal and mini crystals of 1 × 2 × 3 mm3 (length, thickness, height) were used for comparison in the imaging systems for X-rays. With these crystals scintillators, images of undesirable elements, such as metals in food packaging, were obtained. One-dimensional array of photodiodes and the photosensor CCD (Coupled Charge Device) component were used. In order to determine the ideal thickness of the slices of the scintillator crystal CsI:Tl, Monte Carlo method was used.Resumo IPEN-doc 08545 Plastic scintillator detection efficiency for beta and gamma radiations in function of the detector thickness2002 - MADI FILHO, T.; MESQUITA, C.H.Artigo IPEN-doc 03202 Plastic scintillator detector used as water radiation monitor in a swimming-pool research 2MW reactor: correlation analysis between detector results and personal dosimetry1988 - MESQUITA, C.H.; MADI FILHO, T.; HAMADA, M.M.Artigo IPEN-doc 09252 Development of neutron detector using the PIN photodiode with polyethylene (n,p) converter2002 - MESQUITA, C.H.; MADI FILHO, T.; HAMADA, M.M.Artigo IPEN-doc 03933 Desenvolvimento de um monitor de radiocontaminacao da agua utilizando detector plastico cintilador1990 - MESQUITA, C.H.; MADI FILHO, T.; HAMADA, M.M.Artigo IPEN-doc 03937 Estudo do acoplamento optico de detectores plasticos cintiladores: avaliacao de diferentes produtos de silicone1990 - HAMADA, M.M.; MADI FILHO, T.; MESQUITA, C.H.Artigo IPEN-doc 03239 Utilizacao de detector plastico para o controle da radioatividade da agua da piscina do reator IEA-R1 - Acompanhamento da irradiacao de elementos combustiveis fabricados no IPEN1989 - BERRETTA, J.R.; MESQUITA, C.H.; MADI FILHO, T.Artigo IPEN-doc 17358 Development of a fourth generation industrial tomography for multiphase systems analysis2010 - MESQUITA, C.H.; DANTAS, C.R.; COSTA, F.E.; CARVALHO, D.V.S.; MADI FILHO, T.; VASQUEZ, P.A.S.; HAMADA, M.M.Artigo IPEN-doc 07361 Development of neutron detector using the surface barrier sensor with polyethylene (n,p) and sup(10)B(n,alpha) converters1999 - MADI FILHO, T.; HAMADA, M.M.; SHIRAISHI, F.; MESQUITA, C.H.Artigo IPEN-doc 02703 Caracterizacao do cristal cintilador CsI(Tl) desenvolvido no IPEN-CNEN/SP1995 - PEREIRA, M.C.C.; HAMADA, M.M.; MADI FILHO, T.; CALVO, W.A.P.; BRUZINGA, W.A.; VIEIRA, J.M.; MESQUITA, C.H.