This video was produced by NASA and the Department of Energy in the mid-1980s to provide then-current information about the safety of radioisotope power systems (RPS) to be launched with the Galileo spacecraft aboard a crewed Space Shuttle mission. The information and footage in the video is part of the heritage of the current generation of radioisotope power systems.
Information about the Galileo RTGs and safety testing begins at 2:25 into the video. The video is without an audio track.
This video was provided by the NASA Center for AeroSpace Information (CASI), part of the NASA Scientific and Technical Information (STI) Program: http://www.sti.nasa.gov