A teacher using a Geiger counter in class places a sheet of Cobalt 60 in the machine during a demonstration. He then places a piece of lead above this sheet to block the radiation. An animated diagram of radioactive waves. Henri Becquerel examining an exposed photographic plate with his assistant. Animation of radioactive waves, an atom, and artificially created radiation. Men at work in a laboratory. A man cutting a plant. Interior of a nuclear reactor. A man speaking to a staff member at a window marked ‘Health Physics Dept.’ A doctor and nurse treating a patient.