Friday, 28 April 2017

How atomic weapons testing can explain an apparently protective effect of radon for lung cancer risk

"Thus, residential radon does not appear to cause lung cancer but rather to protect, in an exposure-level-dependent manner, from its induction by other agents (e.g., cigarette-smoke-related carcinogens (sic)). - (Scott BR 2011)"
I have long been interested in the theory that low does exposure to radon can reduce the risk of lung cancer because I believe that nuclear fallout from atomic weapons testing can explain why this theoretical protective property exists. The study above hypothesizes that at low doses radon in the home can protect against lung cancer (via some unknown mechanism) but at higher doses can cause lung cancer as the chart, from the study, shows.
It is perfectly plausible that such an effect is real but it could also be true that what causes less radon in the home also causes more lung cancer and in this case rain is a good candidate. The fallout hypothesis predicts that there will be more lung cancer where it rains because radiation will be found in higher concentrations where there is more precipitation. And as the following charts show there is indeed more lung cancer and less radon where there is more rain.


It is obvious why radioactive rain can cause more lung cancer but how can rain cause less radon? Well the answer is that it is believed that rainfall reduces exposure to radon.
"Radon progeny in the air can be removed by rainfall, soil moisture, and snow" (UNSCEAR
2000). source

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