Comment Re: They exist. (Score 1) 72
Those diamond batteries were bullshit. The problem is that as the carbon-14 decays, the structure stops being diamond, because it's no longer made of all carbon. After even a decade or two, the diamond structure will be practically gone and the remaining carbon will impure as balls and in mostly graphite form. Once the structure is damaged enough, it will no longer hold itself together. I suppose you could encase the diamond in something like resin but part of the point of using diamond was the electrical properties (diamond is a good insulator of electricity which makes for good capacitors, the effects of which were being used in the device in part to make it work.). Also, while carbon-14 is screamingly radioactive; it's way, way less so than the currently used tritium. This means you'd a ton more of it to get the same wattage output, although it's longer half-life would mean that it could, assuming it maintained it's structure, last longer than the tritium betavoltaics. But to get it to maintain it's structure long-term would require using proportionally less carbon-14 and more carbon-12 and carbon-13. This means you lose one of the advantages of tritium - size.