What category of time do devices fall under that measure the average radon level over an entire deployment?

Devices that measure the average radon level over an entire deployment fall under the category of time-integrating devices. These devices accumulate data over a specified period, effectively providing an average concentration of radon exposure during that time frame.

Time-integrating measurements are crucial in radon assessment because radon levels can fluctuate throughout the day due to various factors such as weather changes or building occupancy. By integrating data over a longer time interval, these devices yield a more accurate representation of a person's exposure to radon, which is essential for health risk assessments.

In contrast, other categories like instantaneous or snapshot methods provide only a brief moment's measurement, which does not reflect the average exposure over time, while continuous devices measure radon levels in real-time but can also be distinguished from time-integrating measurements based on purpose and data collection methodology.