Which device is used to measure radon levels in water?

The Charcoal Liquid Scintillation Device is specifically designed to measure radon levels in water. This device utilizes a liquid scintillation counting method, where radon gas can dissolve in water and be extracted using activated charcoal. The radon is then detected and measured through scintillation counting, which is an effective technique for quantifying radioactivity in liquids. This method provides reliable measurements, making it a preferred choice for radon in water analysis.

Other methods listed, while useful for measuring radon in air or other applications, are not optimized for water testing. Electret Ion Chambers and Alpha Track Detectors are primarily designed for measuring radon concentrations in air, and RDP Monitors are focused on measuring radon decay products, not directly measuring radon in water. Thus, while they serve important roles in radon measurement, they are not suitable for assessing radon levels in water specifically.