Final answer:
Continuous Working Level Monitors measure radon decay product concentrations, providing a more accurate assessment of actual radiation exposure risk compared to Continuous Radon Monitors, which measure only radon gas levels.
Step-by-step explanation:
Continuous Working Level Monitors (CWLMs) are designed to measure the concentrations of radon decay products, also known as radon progeny, in the air. Unlike Continuous Radon Monitors (CRMs), which measure the radon gas concentration directly, CWLMs provide a measurement of the working levels of radon decay products, which is a more direct indicator of the actual radiation exposure risk to humans. CRMs can give you a good estimate of the radon levels over a period of time, but CWLMs offer a more comprehensive measure of radon-related risk by accounting for the presence of decay by-products that are actually responsible for most of the health risks associated with radon exposure.