Evaluation of the veracity of one work by the artist Di Cavalcanti through non-destructive techniques: XRF, imaging and brush stroke analysis - Kajiya, Elizabeth Alfredi de Mattos; Campos, Pedro Herzilio Ottoni Viviani de; Appoloni, C. R.; Lopes, F.; Rizzutto, Márcia de Almeida (RADIATION PHYSICS AND CHEMISTRY, 2014)