Which type of device is characterized as a long-term, time-integrated radon measurement tool?

The alpha track detector is recognized as a long-term, time-integrated radon measurement tool. This device operates by using a special film that reacts to alpha particles emitted by radon gas over an extended period, typically ranging from a few months to a year. During this time, the detector captures the radiation and, upon analysis, provides an average radon concentration over the measurement period. This long-term integration is crucial for providing an accurate assessment of radon exposure, which can fluctuate widely over shorter time frames due to variations in weather, ventilation, and occupancy.

In contrast, other devices, such as continuous radon monitors, offer real-time measurements but are not designated for long-term assessments. Liquid scintillation counters and solid-state detectors also function differently and are generally employed for short-term or immediate analyses rather than for long-term measurement. Therefore, the alpha track detector stands out for its purpose and methodology in delivering long-term radon concentration data.