What is involved in a radon test?

The first measurement in a building is called a “screening” test. It is designed to separate the buildings that definitely do not have problems from those that may have a radiation problem. This is called a “conservative” approach in the sense that it is careful.

A screening test gives an estimate of the “reasonable” worst-case average levels. If the result is below an action level, then you are finished and don’t need to concern yourself with radon further.

There are only a few key elements of a good measurement:  

  1. The equipment must be calibrated to give accurate results.

  2. The measurement must give the average level over 2 days.

  3. The building must be maintained in “closed house” conditions.

  4. Any ventilation system must be turned off.

  5. The measurement period cannot include any abnormal weather (strong wind or heavy rain).

We take care of (1), our equipment meets, or exceeds, the requirements of the EPA.

Radon levels naturally go up and down and we want a representative value for your house. A test may be scheduled for more than two days if necessary.

Closed house conditions mean that the doors and windows are closed except for normal entrance and exit, just shut the door behind you. The house can still be lived in and, although it may seem a little stuffy, a closed house still has enough fresh air leaking in for 10-15 people. For a real-estate transaction, the doors and windows will be taped to assure that this condition is satisfied.

In the unlikely event that there is a storm or other surprise event during the test, the test period will either be extended or restarted to assure that it is a representative period.

You should not plan any moving, major repairs, parties, etc. during the period of the test. The idea is to mimic a cold, rainy, winter day when the house is naturally closed up. If it is convenient, it is desirable to schedule the test when the house is unoccupied. For example, if you sometimes go out of town for the weekend, schedule the test to include this vacancy.

 

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