Diamond batteries capable of generating electricity for 100 years are being considered for use in space probes and in equipment for underground mining. These batteries use man-made diamonds that generate electricity when placed in a radioactive field. If radioactivity can be controlled and blocked by wrapping these batteries in aluminum or other metal sheets, they can then be put to use.
The research group at NIMS (National Institute for Materials Science, Japan) used electrons, adopted by devices such as electronic microscopes, instead of beta rays for the production of electricity, but it plans to use nickel-63 from now on.
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Source: NIKKEI Asia