Betavolt battery
A betavoltaic device (betavoltaic cell or betavoltaic battery) is a type of nuclear battery that generates electric current from beta particles (electrons or positrons) emitted from a radioactive source, using semiconductor junctions. Some in the 1970s used betavoltaics based on , but were phased out as cheaper lithium batteries were developed. As radioactive material emits radiation, it slowly decreases in activity (refer to ).
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