"Nuclear batteries that produce energy from the decay of radioisotopes can provide a useful amount of current for hundreds of years at power densities a million times higher than standard batteries. Nuclear batteries have been used for military and aerospace applications for years, their large size has limited their general usage. But now a research team at the University of Missouri has developed a nuclear battery the size of a penny that could be used to power micro- and nano-electromechanical systems. The research team is also working on making use of liquid semiconductor technology and replacing it with traditional solid semiconductor. This will make the nuclear batteries safer.
Reference: Slash Dot
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