Initial measurements should be short-term in nature and performed under closed-building conditions. Although multiple short-term and long-term tests give a better estimate of year-round average radon level an initial short-term test, which lasts for 2 to 90 days, ensures that residents are informed quickly should a home contain very high radon levels. Most often, short-term tests are necessary to meet the rigid timeline of a real estate transaction.
Initial Measurement – Initial measurements should be short-term, conducted to quickly identify buildings with elevated radon concentrations and to determine the next best action.
The following protocols must be followed for short-term measurements:
Follow-Up Measurement – Short-term or Long-term measurements conducted in order to confirm an initial measurement and characterize elevated radon concentrations over a longer period of time. Best practice is to conduct follow-up measurements during opposite seasons to detect differences induced by mechanicals [HVAC] or changing weather.
The following protocols must be followed for long-term measurements: