What is the most accurate way to measure radon levels?
Continuous electronic radon monitors generally produce the most accurate radon measurements. However, they are expensive and can be difficult to operate. Year-long measurements by alpha-track (ATD) detectors in your living spaces provide adequate measurements for decision-making. In most homes, radon varies dramatically from day-to-day, week-to-week, season-to-season, and to a lesser extent year-to-year. This means that if you want to assess your long-term exposure to radon, you need to measure over a period of a year or more. In addition, in my opinion, you only need to know your average radon exposure to an accuracy of about 25% in order to make a decision about what steps you might take to reduce your radon exposure. ATDs can readily supply that information at a reasonable cost.
