[ RadSafe ] RE: Toxic Countertops

[John R Johnson]

Ed

The radon could be coming in through the shower.

John
***************
John R Johnson, PhD
CEO, IDIAS, Inc.
4535 West 9th Ave
604-676-3556
Vancouver, B. C.
V6R 2E2, Canada
idias at interchange.ubc.ca

----- Original Message ----- 
From: "Edmond Baratta" <edmond0033 at comcast.net>
To: "'radsafelist'" <radsafe at radlab.nl>; "Dan W McCarn" 
<hotgreenchile at gmail.com>
Sent: Friday, July 25, 2008 9:04 AM
Subject: Re: [ RadSafe ] RE: Toxic Countertops


> 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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>
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