What is the optimal deployment period for open face activated charcoal devices?

The optimal deployment period for open face activated charcoal devices is indeed 2-3 days. This timeframe allows for a sufficient collection of radon gas to provide an accurate measurement while minimizing potential fluctuations in radon levels due to daily environmental changes.

Deploying the device for just 1-2 days might not capture the average radon concentration effectively, as day-to-day variations could lead to an underrepresentation of the actual radon levels present in the home. Alternatively, extending the deployment to 3-4 days may enhance accuracy slightly but could introduce risks of contamination or degradation of the charcoal if exposed for too long, which can interfere with the measurement process. Therefore, the 2-3 day range is a balance that yields reliable data while maintaining the integrity of the charcoal's ability to adsorb radon gas effectively.