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Betacel is considered to be the first commercially successful betavoltaic battery. It was developed in the early 1970s by Larry C. Olsen at the American corporation McDonnell Douglas, using the radioisotope promethium-147 as the beta-electron source coupled to silicon semiconductor cells. This power source was incorporated in the Betacel-Biotronik heart pacemaker. The device was not widely adopted because of its limited lifespan and doubts over the use of radioactive material.
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