SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Pacemaker. Surgeons implanting a cardiac pacemaker powered by a nuclear battery. The battery contains promethium which decays by releasing beta-particles (electrons). These collide with semiconducting materials to generate a current. Modern pacemakers use rechargeable lithium-ion batteries instead. Photographed at the Ivan Pavlov Medical Institute, St.Petersburg, in 1979.
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