Very interesting. I am not a physicist, but the author makes reference
to radium-painted wristwatches producing "cosmic radiation effects" - I
think the more likely (possible) cause is that the radium produces
radon, and the radon is thus a significant source of alpha-induced ions
in the air.
-
Martin

Apptech wrote:
> Better than average EDN technical article with some good 
> insights into measuring nanoamperes and below.
> 
>         http://www.edn.com/index.asp?layout=article&articleid=CA6434367
> 
> Mentions a Paul Grohe and Bob Pease lashup that resolved 1 
> Femtoamp.
> 
> Suspended on rubber bands. Looks like some of the things I 
> have built over the years. No doubt works a lot better :-).
> 
>         http://www.edn.com/contents/images/6434367f4.pdf
> 
> 
>         Russell
> 

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