[Cryptography] Radioactive random numbers

[Dave Horsfall]

Another whacky idea...

Given that there is One True Source of randomness to wit radioactive 
emission, has anyone considered playing with old smoke detectors?

The ionising types are being phased out in favour of optical (at least in 
Australia) so there must be heaps of them lying around.

I know - legislative requirements, HAZMAT etc, but it ought to make for a 
good thought experiment.

-- Dave