[ RadSafe ] RE: Toxic Countertops

[Edmond Baratta]

Sounds good to me!!!  I have one in my bathroom and have detected no 
increase in radon.

Ed Baratta

edmondoo33 at comcast.net

----- Original Message ----- 
From: "Dan W McCarn" <hotgreenchile at gmail.com>
To: "'radsafelist'" <radsafe at radlab.nl>
Sent: Thursday, July 24, 2008 3:24 PM
Subject: RE: [ RadSafe ] RE: Toxic Countertops


> Gentlemen:
>
> It all depends on the permeability of the granite!  Even relatively active
> granites usually have very low primary permeability so radon is retained
> within the mineral grains and rock itself to a great degree.  That's why
> granites are usually in secular equilibrium with all uranium daughters
> because they retain radon until it decays.  Most of the activity measured 
> by
> a scintillation counter comes from the Bi-214 decay at the end of the 
> chain.
> At a larger scale, where granites are fractured and faulted and develop
> significant secondary permeability, is there a good likelihood that radon 
> in
> significant quantities will be fluxed via changes in barometric pressure 
> to
> the surface, and these examples are noteworthy.
>
> But in countertops, chosen to avoid fractures, that is unlikely.  Most of
> the radon would be only from the very near surface.  The radon from deeper
> inside would have virtually no chance of diffusing to the surface.
>
> My opinion only!
>
> Dan ii
>
> Dan W. McCarn, Geologist; 3118 Pebble Lake Drive; Sugar Land, TX 77479; 
> USA
> HotGreenChile at gmail.com   UConcentrate at gmail.com
>
>
> -----Original Message-----
> From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On 
> Behalf
> Of Bob Cherry
> Sent: Thursday, July 24, 2008 1:30 PM
> To: 'Chris Cherry'
> Cc: 'radsafelist'
> Subject: [ RadSafe ] RE: Toxic Countertops
>
> Good point about the cemeteries! I will remember this and try to avoid
> spending a lot of time in one as long as I can.
>
> -----Original Message-----
> From: Chris Cherry [mailto:cpdcherry@]
> Sent: Thursday, July 24, 2008 1:24 PM
> To: Bob Cherry
> Subject: RE: Toxic Countertops
>
> I'm sure more people are harmed in quarrying the stone and installing it
> than get cancer from its radioactivity.
>
> Someone on the medphys list mentioned that cemeteries are full of both
> granite and dead people.  This may not be a coincidence.
>
> -CC
>
>
> --- On Thu, 7/24/08, Bob Cherry wrote:
>
>> From: Bob Cherry
>> Subject: RE: Toxic Countertops
>> To: "'Chris Cherry'"
>> Date: Thursday, July 24, 2008, 1:18 PM
>>
>> Old news. We almost got a
>> consulting job on this.
>>
>> -----Original Message-----
>> From: Chris Cherry
>> Sent: Thursday, July 24, 2008 1:15 PM
>> To: Bob Cherry
>> Subject: Toxic Countertops
>>
>> The article mentions the guy at Rice.
>>
>>
> <http://www.nytimes.com/2008/07/24/garden/24granite.html?pagewanted=2&_r=1&n
> o_interstitial>
>>
>> -CC
>
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