• WordNet 3.6
    • n radon a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
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In literature:

Just a little radon leaking out would do it.
"Planet of the Damned" by Harry Harrison

In news:

The Federal Government Takes Action on Radon Gas to Prevent Lung Cancer Deaths in 2011.October 17th 24th is Radon Awareness Week.
Children's radon poster contest seeks entries.
Utah children have an opportunity to raise awareness about the risks of indoor radon by participating in the 2013 National Radon Poster Contest.
Though the gas won't cause immediate harm, it's important to test your house for radon levels, says the Wyoming Department of Health.
The Environmental Protection Agency says as many as 20,000 Americans will die this year from lung cancer induced by exposure to radon in homes (news story, Aug 5).
The American Lung Association, Centers for Disease Control and National Cancer Institute all agree that radon is a national health problem and encourage radon testing.
Radon gas enters your home in the following ways.
The New Hampshire Department of Environmental Services (DES), in recognition of January as National Radon Action Month, is encouraging homeowners to test their homes for radon .
A friend recently asked that I write about radon gas in the home and how it can affect the sale of real estate.
Here is my experience with radon and radon testing.
Underground Radon Detectors Could Forecast Earthquakes Days Before They Happen.
How The Radon Detector Might Work Some scientists think that undetectable rumblings precede a quake by as long as a few days.
In this how-to video, This Old House host Kevin O'Connor discovers an effective method of clearing radon from a home.
How to Install Radon Mitigation.
A.M UPDATE: Cherokees offer radon safety course.

In science:

The Radon-Nikod´ym derivative dµN ,β /dµN = exp(−βHN (ω ))/ZN (β ) is interpreted as a Boltzmann factor, making more rare tra jectories with many self-intersections in the statistical sample described by the measure µN .
On the physical relevance of random walks: an example of random walks on a randomly oriented lattice
The DΓ′ -dimensional conformal measure (Patterson-Sullivan measure, see end of §3) σy has Radon-Nikodym derivative of P (y , ξ )DΓ′ , i.e.
Quasiconformal Rigidity of Negatively Curved Three Manifolds
Radon-Nikodym derivative with respect to λ is f We will write F E V (µ) = F E (µ) when the choice of potential is clear from the context.
Random Surfaces
We can also write this expression as µ(V + log f ), where f is the Radon-Nikodym derivative of µ with respect to λ.
Random Surfaces
Otherwise, let fn and gn be the Radon-Nikodym derivatives of µΛn and νΛn , respectively, with respect to πn .
Random Surfaces