Radioactive lint was a fictional clandestine tracking and anti-personnel solution devised by the British Secret Intelligence Service's (SIS/MI6) research and development division, Q-Branch. It appeared during the 1969 James Bond film, On Her Majesty's Secret Service.
Appearance[]
Believing their current equipment to be obsolete, Q-Branch, with the aid of computer analysis, turned their attention to miniaturisation. One proposed example of this was radioactive pocket lint, designed to merge in with the visible accumulations of textile fibers and other materials, usually found on a target's clothing. The lint could then theoretically be tracked, or gradually harm its victim. Shown during a meeting between Q and the Head of SIS, M, it is unknown whether the equipment was ever deployed in the field.