[ RadSafe ] Skyshine measurements

Joseph Shonka jjshonka at shonka.com
Sat Mar 23 16:11:22 CDT 2013

Skyshine comes from scattering in the atmosphere above the facility, not
from clouds per se.  The differences you observe are likely due to cold air
having greater density than warm air.

Joseph J. Shonka, Ph.D.
Shonka Research Associates, Inc.
119 Ridgemore Circle
Toccoa, GA 30577

On Wed, Mar 6, 2013 at 1:39 PM, Kenneth Marshall <
kenneth.marshall at carestream.com> wrote:

> When performing Non Destructive Testing (Industrial Radiography) Surveys,
> I have observed a big difference in skyshine scatter.  Same location, same
> source intensity, different precipitation.  Snowy days did seem to give
> the greatest amount of skyshine, like jumping up 25% or more than a clear
> day but the distance wasn't thousands of feet, In my experience it was
> maybe dozens of feet away.  I would think it would be worse in a day of
> "precipitation" (snow/rain)  where your sky shine comes from closer
> scattering points than higher altitude clouds.
> Kenneth Marshall
> Carestream Health Radiation & Laser Safety Officer
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