FWIW I'm developing a radon detector and using a thoriated mantle 
(emitting thoron) to test it.
Radon is the #2 cause of lung cancer, I bet you can guess the first.
--
Martin K

Russell McMahon wrote:
> Indeed.
>
> Mantles for pressure lanterns are another source.
>
> Some US houses have had such high Radon levels that they have had to 
> be abandoned.
>   

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