There's a quick and easy way to tell if they are leaking any radio activity, apparently one of the first signs is that your hair turns Orange :wh
Beta isotopes start radioactive but decay overtime to form more stable isotopes. All the radiactive particles are absorbed by the casing of the isotope so IMO they are completely harmful (unless crunched in the mouth and then ingested
- there you have been warned).
That Russian Agent discovered what the signs were regarding that special radioactive element, polonium. I think he lost his hair, his skin began to break down, his internal organs grew tumours and was bleeding from orrifices that shouldn't......... Radiation doesn't glow. I believe the emmitted energy 'excites' particles on the inner surface of the isotope..
I think isotope rod fittings are fine - just avoid Rusian dissidents and Polonium Sushi.