VITOR VIVOLO
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Artigo IPEN-doc 23025 Mass attenuation coefficients of X-rays in different barite concrete used in radiation protection as shielding against ionizing radiation2017 - ALMEIDA JUNIOR, T.A.; NOGUEIRA, M.S.; VIVOLO, V.; POTIENS, M.P.A.; CAMPOS, L.L.The probability of a photon interacting in a particular way with a given material, per unit path length, is usually called the linear attenuation coefficient (μ), and it is of great importance in radiation shielding. Plates of barite concrete with different thickness were fabricated in order to determining their mass attenuation coefficients at different energies. The plates were irradiated with ISO X-ray beams (N60, N80, N110 and N150), generated by Pantak HF320 X-ray equipment, at the IPEN laboratory. The mass attenuation coefficients of barite concrete have been measured using X-ray attenuation for different thicknesses of barite concrete qualities of the ISO. The attenuator material issued from different regions of Brazil. The experimental procedure in this research was validated by comparison between the experimental measurements of mass attenuation coefficients and coefficients determined by the same atomic composition, using as a tool to XCOM. The highest value of (μ/ ρ) found experimentally was in the energy of 48 keV, in ISO 60 N quality, being 1.32( ± 0.49) for purple barite; 1.47( ± 0.41) for white barite and 1.75( ± 0.41) for cream barite. The determination of the chemical composition of the barite samples was of fundamental importance for the characterization of these materials. It can be seen that both calculated and measured data for the linear attenuation coefficients increase with the increasing materials density, as it is expected. It can be concluded that the photon attenuation coefficients depends on the photon energy and the materials density is the main contribution to the photon attenuation coefficients, which is important for radiation shielding.Artigo IPEN-doc 20883 Response and Monte Carlo evaluation of a reference ionization chamber for radioprotection level at calibration laboratories2015 - NEVES, LUCIO P.; VIVOLO, VITOR; PERINI, ANA P.; CALDAS, LINDA V.E.Artigo IPEN-doc 20030 Intensity variation study of the radiation field in a mammographic system using thermoluminescent dosimeters TLD-900 (CaSOsub(4):DY)2014 - CORREA, E.L.; SILVA, J.O.; VIVOLO, V.; POTIENS, M.P.A.; DAROS, K.A.C.; MEDEIROS, R.B.