What is radon?

The Uranium is a radioactive element that occurs naturally in low concentrations in all rocks and soils. Radioactive decay product of radium, which in turn decays into radon, a radioactive inert gas colorless and odorless. Since it is a gas, radon can escape easily bedrock and soil to the outside air or seep into a house or building. Since all soils contain uranium, radon is present in all soil types. Radon escapes from the ground to the atmosphere is quickly diluted to concentrations too low to be of concern to human health.

Pressure of air inside a building is generally lower than that of soil surrounding the foundation . This causes suction of air and other gases from the ground, including radon, through all the openings in the foundation in contact with the ground. For example, construction joints, openings around connections and support columns, floor drains and sumps, cracks in foundation walls and floor slabs and cavities in concrete block walls. Once in the home, radon can accumulate to high concentrations may pose a long term risk to health.

In some areas, radon in water sources can contribute to indoor radon concentration in the building. In
these cases, radon dissolved in water as it travels through the rock and soil. This is usually associated with
groundwater sources, and thereby affects more water from wells rather than surface water used in most
municipal water supplies. Large volumes of water are used among other things for the shower, washing,
etc.., And  radon can be released into the air if it is present in the water. However, the health
risk associated with radon dissolved in water is not from the ingestion of water, but instead of inhaling the
air in which radon was degassed.
All these routes entry are shown in Figure 1.
Reducing the Canadian guide to the use of concentrations of radon professional entrepreneurs
in existing homes:
Figure 1 – Moving radon (Courtesy of Natural Resources Canada)
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Radon Chapter A Overview 1:
Although high concentrations of radon are associated with certain geological formations, soil type, type
of dwelling and construction of foundations differ so much from one place to another that maps “danger
zones “related to radon are only poor indicators of actual radon concentration in a home. Even identical
houses located close to each other can have average radon concentrations quite different. The only way to
know if a home has a high radon level is to measure the concentration.