Probably smoke detector americanium241 buttons, nice safe (relatively) radiation source, just don't eat 'em
Mostly they put out alpha, which as long as it is outside you isn't an issue. If you inhale or swallow an alpha emitter you're in real trouble though.
Failing that, you can buy low output sources from a couple different legitimate dealers online, or on ebay.
I didn't get past the theory stage though.
Mostly they put out alpha, which as long as it is outside you isn't an issue. If you inhale or swallow an alpha emitter you're in real trouble though.
Failing that, you can buy low output sources from a couple different legitimate dealers online, or on ebay.
I didn't get past the theory stage though.