INVESTIGADORES
PÉREZ Pedro Antonio
congresos y reuniones científicas
Título:
Characterization of radiological water-equivalence of gel dosimeters by computed tomography
Autor/es:
VALENTE, M.; VEDELAGO, J.; CHACÓN OBANDO, D.; MATTEA, F.; PÉREZ, P.
Lugar:
La Plata
Reunión:
Congreso; 102 Reunión de la Asociación Física Argentina; 2017
Institución organizadora:
Asociación Física Argentina
Resumen:
International dosimetry protocols are based on determinations of absorbed dose to water. Ideally, the phantom material should be water equivalent; that is, it should have the same absorption and scatter properties as water.This study presents theoretical, experimental and Monte Carlo modeling of water-equivalence of Fricke and polymer (NIPAM, PAGAT and itaconic acid ITABIS) gel dosimeters. Mass and electronic densities along with effective atomic number were calculated by means of theoretical approaches. Samples were scanned by standard computed tomography. Photon mass attenuation coefficients and electron stopping powers were examined by Monte Carlo simulations, as well as dosimetric magnitudes. Theoretical, Monte Carlo and experimental results confirmed good water-equivalence for all studied gel dosimeters. Overall variations with respect to water in the low energy radiology range (up to 130kVp) were found to be less than 3 % in average.
