[ RadSafe ] Fwd: Fwd: [New post] Raised radiation level found inMissouri ...
Andycgeo at aol.com
Andycgeo at aol.com
Tue Jan 7 14:05:36 CST 2014
In a message dated 1/7/2014 3:03:34 P.M. Eastern Standard Time,
Andycgeo at aol.com writes:
Hi Joe: The low emanation rates to the outside air were low. However the
radon tended to move downwards into drier and more porous soil and if
there
is a home next to it the radon will increase indoors. This is also seen
after sustained heavy rains that prevent the radon to emanate outside
(the
water clogs up the soil pores and prevents it to exhlate in the outside
air).
You get indoor radon spikes during the rainfall and a few hours after it
stops.
Andy G.
In a message dated 1/7/2014 2:52:57 P.M. Eastern Standard Time,
jjshonka at shonka.com writes:
Andy
Wasn't the bulk of the radon you were measuring from a few days upwind of
the NJ site? Radon is quite low along the beach in California, because
the
Pacific Ocean is many radon half lives wide. It builds up to equilibrium
as the prevailing westerly winds carry the parcel of air to the east.
Thus, the soil conditions upwind of you site are what drives the local
radon concentration.
Joe
On Tue, Jan 7, 2014 at 2:24 PM, <Andycgeo at aol.com> wrote:
> Back in the 1970's I made lots of radon emanation measurements from
soil
> during all seasons in Chester New Jersey. In the last two weeks of
January
> and the first two weeks of February when the top 2-3 inches of soil
was
> frozen the radon emanation dropped by a factor of 20-30. I expect that
a
> similar reduction in emanation will occur with ice on top of the soil.
>
> Andy George
>
>
> In a message dated 1/7/2014 2:09:20 P.M. Eastern Standard Time,
> jjshonka at shonka.com writes:
>
> When the ground freezes, radon emanation rates go to near zero. The
> ground
> a few hundred kilometers west of the area provides most of the radon
seen
> in the atmosphere in the northern hemisphere. This radon would be
> available for co-precipitation during rainfall or snowfall events.
When
> spring thaw comes, radon can be much higher than "normal" for a short
time
> due to higher than normal levels of radon in the ground. ANL reported
an
> incident many years ago due to this phenomenon.
>
>
> On Tue, Jan 7, 2014 at 12:34 PM, Chris Alston <achris1999 at gmail.com>
> wrote:
>
> > Folks
> >
> > What is happening to the radon source term, given the cold and
> > snowpack? I can remember, many years ago, when I was green as a
> > grasshopper, doing verification of remedial action for depleted U
on a
> > property (a large lawn or backyard, from which we had stripped the
> > sod) with a FIDLER, during an afternoon when it was warm, sunny, and
> > breezy. I went back to finish work the next morning, when it was
> > cold, damp, and heavily foggy (the airport was socked-in). The
whole
> > area was "hot" again. Baffled, I walkie-talkied my boss. He
laughed,
> > and explained, basically, that due to the low-pressure, more
*natural*
> > radon was emanating from the soil, and it was not moving much, due to
> > the cold, so the daughters were ingrowing. In effect, our carefully
> > determined gamma background for the area was out the window.
> >
> > Cheers
> > cja
> > ---------- Forwarded message ----------
> > From: Brennan, Mike (DOH) <Mike.Brennan at doh.wa.gov>
> > Date: Tue, Jan 7, 2014 at 11:59 AM
> > Subject: Re: [ RadSafe ] Fwd: [New post] Raised radiation level found
> > inMissouri Snow
> > To: "The International Radiation Protection (Health Physics)
> > MailingList" <radsafe at health.phys.iit.edu>
> > I don't know the answer to this offhand, but how does the response of
> > a GM tube change with temperature? The reason I ask is that it is
> > currently COLD in much of the Midwest, and it wouldn't surprise me if
> > things are different at -20C.
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>
>
> --
> Joseph J. Shonka, Ph.D.
> Shonka Research Associates, Inc.
> 119 Ridgemore Circle
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> 770-509-7606
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--
Joseph J. Shonka, Ph.D.
Shonka Research Associates, Inc.
119 Ridgemore Circle
Toccoa, GA 30577
770-509-7606
This e-mail, and any attachments thereto, is intended only for use by the
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