Radonova Long Term Radon Test KitLong Term Radon Home Test Radtrak is more expensive than a traditional charcoal test because it delivers far greater accuracy and reliability. Charcoal tests measure radon for only 27 days and are easily affected by short term weather. Radtrak uses advanced alpha track technology to measure over 90365 days, providing an accurate picture of your true radon levels. This extremely accurate test will take into account all of the daily fluctuations in