Which is a characteristic of continuous radon monitors?

Continuous radon monitors are designed to provide real-time measurements of radon levels in indoor environments. One of their notable characteristics is that they can be recalibrated periodically, which ensures the accuracy and reliability of the monitoring process. Regular calibration is essential for maintaining the integrity of measurements over time, as it helps to account for any potential drifts in the equipment’s sensitivity or performance due to aging or environmental changes.

The ability to recalibrate gives users confidence that the monitor will deliver precise readings, which is critical in contexts where radon mitigation decisions must be made based on these measurements. Continuous radon monitors can be a more flexible tool, as they frequently deliver updated data on radon concentrations, responding to environmental changes instantly, making the calibration process an integral part of their operation.

The other options present comparisons or stipulations that do not accurately characterize continuous radon monitors, thus confirming option C as the most relevant and correct answer regarding their characteristics.