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It's indoor radon exposure that poses the greatest risk due to the increased likelihood of inhaling radioactive decay products in a confined space.
According to the government's National Radon Action Plan (NRAP), exposure from building materials is generally at a low level, however the bigger risk comes from it being drawn into homes from the ground.
In the meantime, the nonprofit Conference of Radiation Control Program Directors has issued guidance urging health care providers to discuss radon exposure with their patients.
Every building contains radon but the levels are usually low.
One major problem with many radon studies is that they are very much under-powered, resulting in uncertain and contradictory conclusions.
We previously reported that radon inhalation could enhance antioxidant function in various organs in mice, such as the brain, lung, pancreas, liver, and kidney (Kataoka et al., 2011).
If radon is present in the soil, more of the gas is pulled into the home during this cold weather.
Previous interventions that increased participants' perceived risk to radon, however, failed to improve test kit orders across treatment levels and compared with controls (Weinstein et al., 1990, 1991).
One of the doctors treating them found it was so unusual for two people, non-smoking, living in the same house to have lung cancer that he said get the radon levels checked.
The Environmental Protection Agency's Barbara Rafferty added: "No model - no matter how sophisticated - can substitute for having indoor radon levels tested.
Indoor radon and thoron measurements were divided into two phases of one year each.
Radon is a colorless and odorless radioactive gas that can cause severe damage to human body (Lamonaca et al., 2014), including an increased probability of lung cancers, when it is present in concentrations above 200 Bq/[m.sup.3].