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What is the difference between short-term and long-term testing?

April 26, 2017difference long-term short-term Testing

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What is the difference between short-term and long-term testing?

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The EPA “danger” level of 4 pCi/L actually represents an annual average. Because radon levels tend to vary from day to day, and season to season, a short-term test (days) is less likely than a long-term test (months) to approximate the year-round average radon level. However, when results are needed quickly, a short-term test followed by a second short-term test, or two short-term tests placed side by side, and the results averaged, is adequate. The test should last at least 48 hours for either approach.