November 1999
Workers entering the Super Collider at the Argonne National Laboratory near Chicago used to trigger radioactivity alarms when it rained.
It was discovered that rainwater deposited on their shoes and hands carried radioactive decay products of radon.
The laboratory developed special radiation monitors to detect the specific gamma rays emitted by radon progeny in rain clouds.
During the first year of operation the alarm was triggered nine times.
Since the radon alarms occurred simultaneously at two monitors approximately 1,000 meters apart, it proved that large radon-saturated clouds are regularly passing over populated areas.
It confirmed that radon released by wastes from uranium mines in the West can travel hundreds of miles across America.Source: Health Physics, November 1999
http://www.radonseal.com/radon-facts.htm#clouds
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