What is the term for devices that take an instantaneous measurement of radon?

The term for devices that take an instantaneous measurement of radon is "Grab Devices." These devices are designed to collect a single air sample at a specific moment in time, which allows for a rapid measurement of radon levels in the environment. Grab devices can provide immediate insights into the radon concentration present in an area, making them useful for quick assessments and spot measurements.

In contrast, other options refer to different types of radon measurement technologies. Time-integrating devices typically measure radon over an extended period and average the concentration over that time frame. Continuous monitors provide ongoing data in real time but measure radon continuously rather than instantaneously. Radon sensors encompass various devices, including continuous monitors but do not specifically refer to those that take instantaneous measurements like grab devices do. These distinctions are crucial in understanding the different tools available for radon measurement and their specific uses.