Radon Gas

Certainly not a common topic, but it does come up from time to time in our profession. Although certainly not a healthy situation to find yourself in, it's not the end of the world either. As indicated below, if the amount of Radon gas has an "average annual radon concentration in the normal occupancy area exceeds 200 becquerels per cubic meter" it's time to take remedial measures. Once it exceeds this level, then there is the potential threat of developing lung cancer (and I thought smoking was to blame for all lung cancer!). Remedial actions are suggested below.

It's not all scary, just another one of those things to be mindful of. As an example, if your attic has vermiculite insulation (the type that contains asbestos), it's okay as long as it's not disturbed, once it's disturbed, then the asbestos particles have a chance to get into the lungs, and the potential for lung cancer exists.   Be careful out there!!! Especially if you're thinking of buying privately. It is a REALTOR'S® fiduciary obligation to DISCLOSE all pertinent facts about a property. Private home sellers don't always feel obliged to do so.   

Below is taken off Health Canada's website: http://www.hc-sc.gc.ca/hl-vs/iyh-vsv/environ/radon-eng.php 

The Issue

Exposure to high levels of radon increases the risk of developing lung cancer. This relationship has prompted concern that radon levels in some Canadian homes may pose a health risk.

Background

Radon is a colourless, odorless, radioactive gas that occurs naturally in the environment. It comes from the natural breakdown of uranium in soils and rocks.

The Health Effects of Radon

In the open air, the amount of radon gas is very small and does not pose a health risk. However, in some confined spaces like basements and underground mines, radon can accumulate to relatively high levels and become a health hazard. Exposure to high levels of radon has been associated with an increased risk of lung cancer, depending on the time length of exposure.

Because it is radioactive, radon decays. As it decays, it produces decay products, sometimes called "radon daughters" or "radon progeny". Two of these progeny, polonium-218 and polonium-214 decay rapidly themselves, and emit alpha particles. When alpha particles hit an object, the energy in them is absorbed by the surface of the object. Human skin is thick enough to not be affected, but if you breathe in alpha particles, they can damage bronchial and lung tissue, and can lead to lung cancer.

Studies of the incidence of lung cancer among uranium miners showed a correlation between radon exposure and deaths from lung cancer. Until recently, there had been no evidence of a direct link between radon levels in the home and lung cancer. However, two recent independent scientific studies in Europe and North America show that lung cancer risks extend to levels of radon found in some homes.

Radon in the Home

Radon gas can move through small spaces in the soil and rock upon which a house is built. It can seep into a home through dirt floors, cracks in concrete, sumps, joints, basement drains, under the furnace base and jack posts if the base is buried in the floor. Concrete-block walls are particularly porous to radon and radon trapped in water from wells can be released into the air when the water is used.

A survey conducted by Health Canada in the 1970s showed that radon levels in certain Canadian cities were higher than in others. However, these same studies showed that it is impossible to predict whether any one house will have a high level of radon. Factors such as the location of the house and its relation to the prevailing wind may be just as important as the source of the radon.

Measuring Radon Levels in the Home

Commercial services are available to homeowners who wish to measure radon levels in their homes. Radon is measured in units called "becquerels per cubic meter". The most popular radon detectors are the charcoal canister, the electrets and the alpha track detector. These devices are exposed to the air in a home for a specified period of time, and then sent to a laboratory for analysis. There are other techniques for testing radon levels, but they require a trained operator and are more expensive.

Minimizing Your Risk

Health Canada's studies show that high radon levels are not widespread in Canadian homes. However, it is difficult to predict the level in any one home. If you are concerned about exposure to radon gas in your home, you might consider testing the level to see if it exceeds Canada's guideline for exposure to radon in indoor air. The guideline, which was updated in 2007, recommends that:

• Remedial measures be taken in a dwelling whenever the average annual radon concentration in the normal occupancy area exceeds 200 becquerels per cubic meter.
• The higher the radon concentration, the sooner remedial measures should be taken.
• When remedial action is taken, the radon level should be reduced to a value as low as practicable (i.e., reduced as much as possible using methods that are cost-effective).
• The construction of new dwellings should employ techniques that will minimize radon entry and will facilitate post-construction radon removal, should this subsequently prove necessary.

Because there is some risk at any level, homeowners may want to reduce their exposure to radon, regardless of levels tested. Some of the steps you can take to reduce radon levels in your home include:

• Renovating existing basement floors, particularly earth floors.
• Sealing cracks and openings in walls and floors, and around pipes and drains.
• Ventilating the sub-floor of basement floors.

By: Kevin Stacey, REALTOR®

www.century21.ca/kevin.stacey