Yes, you too can have nuclear power in your own home. Seems to actually work. Only one problem…
In short, little sealed glass vials of beta-emitting tritium with a phosphor coating on the inside to convert the beta radiation into visible light are sandwiched between two PV cells. This leads to a battery that puts out just enough juice to power very small devices. Cool! The problem is that those tritium vials cost about $15 to $30 a pop, so you’re looking at more than $30 in parts to make said nuclear battery. Is it cost effective? Is it fundamentally practical? Mmmm… probably not. But for less than a hundred bucks, you end up being able to boast that your thermometer or some such is Nuclear Powered.
Here’s another, talkier video describing much the same thing: