Testing for Radon Gas
Homeowners can buy test kits for about $20.00 each. A short term test requires a minimum of two days of exposure after twelve hours of closed house conditions. The lower the radon level is, the longer the exposure time needs to be in order to provide sufficient data for the laboratory to make an accurate assessment of the radon level. Hence, a third day would improve the accuracy. The test kit must be sent to the laboratory indicated on the kit. The shorter the time between the termination of the exposure and the start of laboratory analysis, the more accurate the results will be. Overnight or second day air are best. Priority mail is the minimum shipping mode suggested by most laboratories. Results of the test are normally back to you by first class mail within one to two weeks. A homeowner test is an inexpensive and convenient option for most people.
Short term radon tests range from two through ninety days. Short term tests are typically deployed for just two to five days due to time constraints. A two day test will indicate if further testing is warranted. If the level is over 3pCi/L a second short term test can be performed and the results of the two tests can be averaged to determine the level and can be utilized to expedite a decision on whether remedial action is warranted.
Long term tests range from ninety one days to a year and are a better gauge of the long term exposure. More data means a higher confidence level and the actual radon level will vary somewhat through weather changes and seasons.
Radon tests prompted by an impending real estate transaction require a high level of care and confidence due to the fact that the seller usually controls the house and the potential buyer normally requests the test be conducted. The use of a continuous radon monitor offers evidence as to the consistency of the conditions in the house during the test. This provides the buyer some assurance of an accurate reading. If the average reading is over 4pCi/L corrective action is warranted.