> David Hahn came to mind when I read this.
>
> http://en.wikipedia.org/wiki/David_Hahn


Indeed.

Mantles for pressure lanterns are another source.

Some US houses have had such high Radon levels that they have had to 
be abandoned.



>> > I don't think I'd bother personally, but a smoke alarm would be a
>> > radioactive source not too hard to get hold of. Although I can't
>> > say I've ever seen a scrapped one
>>
>> Diet salt, potassium chloride, is fairly radioactive.

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