The article describes the scientific trajectory of the physicist and Jesuit priest Francisco Xavier Roser, who is the founder of the Physics Department of the Pontifical Catholic University of Rio de Janeiro, and one of the pioneers of the study of natural radioactivity in Brazil. The article includes a biography and a discussion on the most relevant aspects of Fr. Roser's scientific career.
Keywords:
Experimental Physics; Cosmic Rays; Natural Radioactivity; Society of Jesus; Pontifical Catholic University
