Sunday, November 2, 2014

Radon

Radon is a colorless, odorless inert gas. It was discovered be the English physicist Ernest Rutherford in 1899. In 1900, German physicist Friedrich Ernst Dorn discovered the gas releasing properties of radium; radon gas. Radon gas easily penetrates most common materials, such as paper, plastics, concretes and wood due to its natural state as a single atom. Also, radon gas is soluble in water and organic solvents. These properties of radon gas are in part which makes it such a concern. Radon gas is radioactive and is released from the natural decay of uranium, thorium and radium. The two main types of radon that are prevalent in the human environment are radon-222 and radon-220. Radon-222 occurs from the decay of uranium where radon-220 occurs from the decay of thorium. Radon-222 is the form of radon that most readily -happens in the environment. The byproducts of the decay of radon-222 readily attach to the airborne particles and can easily be inhaled.

When humans are exposed to radon gas, the particles can damage cells with the body. Damage to the lungs is the most widely recognized association to radon exposure. Lung cancer is directly linked to radon gas. Each year, the United States has 15 to 22 thousand cases of lung cancer deaths directly linked to radon gas exposure each year. Radon gas has a quick rate of decay, which causes radioactive particles to be released. These are the particles which enter the body, mutate cells of the lungs, and lead to cancer. Overall, radon gas exposure is the second leading cause of lung cancer.

Radon gas is not a man made chemical product, but solely a naturally occurring product. It can be found in igneous rock and soil. There are a few scientific uses for radon gas such as initiating and influencing chemical reactions, however, there are no practical uses.

Radon gas causes major health issues, and is prevalent in the built environment. Houses and office buildings built on soil heavy in the elements uranium, thorium, and radon tend to have a higher affinity to radon gas. Also, basement levels and highly insulated areas have a higher radon level. Radon can be found in every building. It has been stated that radon levels higher than 4 picocuries per liter (pCi/L) is unsafe for living conditions. Radon can enter a building in many methods. Cracks in concrete, exposed soil in basements or crawlspaces, open drains to sump pumps, loose pipe fittings, and well water are some of the various ways that radon gas can enter a structure.

Due to the colorless, odorless, and tasteless nature of radon gas, it is impossible to tell the level of radon in a building without testing. If a high level of radon gas is present, the most reliable method of mitigation is known as sub slab suction. This places pipes under or in the foundation of a house to guide radon gas away. Other, less permanent, methods of reducing radon gas inside a building can be house pressurization, natural ventilation, heat recovery ventilation and sealing up cracks in a building's foundation.

Common Entry Points For Radon Gas

Mortalities by Cancer Type - 2010

 Natural Radon Levels - EPA



http://enhs.umn.edu/hazards/hazardssite/radon/radonprevention.html
http://www.epa.gov/radon/
http://www.radon.com/radon/radon_facts.html
http://www.cancer.gov/cancertopics/factsheet/Risk/radon

http://www.health.state.mn.us/divs/eh/indoorair/radon/