Fecha de publicación: -- Fuente: WIPO "tomato" There is described an electron beam emitting device (11) comprising: - a main housing (12) internally defining an inner compartment (13) and having an exit window (16); - a generation member (14) arranged within the inner compartment (13) and configured to emit electrons and to direct the electrons through the exit window (16) and out of the inner compartment (13); - a protective element (18) arranged at the exit window (16); the protective element (18) comprises at least two of titanium, tantalum and niobium.