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Are these actually being sold now? I first saw these advertised by citylabs years ago with vague wording on availability and maybe-pricing in the $3k range.

• arcticbull 7y ago
  My understanding is there have been betavoltaic cells for a long time, and with improvements in semiconductor manufacturing technology, they've been able to move towards less radioactive materials such as the tritium used by citylabs. These things exist, but of course, tritium is not cheap.
  • galangalalgol 7y ago
    Strontium 90 seems like a good candidate. It and what it decomposes into are both pure beta emitters. Beryllium 10 also looks good, though very low power. Someone recently used nickel 63 too.
    • arcticbull 7y ago
      > Someone recently used nickel 63 too. Yeah the Russians, right? (https://newatlas.com/nickel-nuclear-battery-design/54884 https://newatlas.com/nickel-nuclear-battery-design/54884)