Stephen nous apporta ses lumieres en ce 2008/01/11 11:18:
> On Fri, 11 Jan 2008 15:26:16 -0000, "Phil Cook"
> <phi### [at] nospamrocainfreeservecouk> wrote:
> 
>> I think the fact it doesn't 'do anything' from our limited perception on  
>> matters makes it seem rarer, a bit like the fact that nitrogen forms a  
>> greater percentage of air then oxygen sometimes comes as a shock to people.
> 
> Isn't there a rare gas that seeps into the basements of houses in Cornwell and
> similar areas that is toxic?
> 
> Regards
> 	Stephen
Radon is radioactive. But, as it's a "noble" gas, it's non-reactive and thus 
can't be toxic. To be toxic, a substance need to be able to easily react with 
other substances.
As radon is radioactive, it cause some ionisation in other substances. That 
ionisation can denaturate some substances. But radon's radioactivity is very 
weak. You need a lot of it over several years for it to become a problem. Any 
basement where you go more than 4 times a year will have to much air movement to 
be able to get a critical radon concentration. Also, the floor need to be 
permeable, while the walls and ceiling need to be prety air tight.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you tell stories to your kids that 
include stuff like "Once there was a polygon mesh who was very sad because he 
was only Gourard shaded."
     -- Taps a.k.a. Tapio Vocadlo

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