Which device measures RDPs using a filter and light flashes?

The correct choice is the scintillation disk, which is designed to measure radon decay products (RDPs) by employing a filter and detecting light flashes. This type of device captures alpha particles emitted by RDPs that pass through the filter. When these alpha particles collide with the scintillation material, they produce tiny flashes of light. These flashes are then counted to determine the concentration of radon decay products present in the air, providing a reliable method for measurement.

Other devices mentioned, while they each play a role in radon detection, utilize different methodologies. The solid state silicon detector typically measures radiation through silicon-based semiconductor technology, focusing more on direct detection of radiation rather than specific RDPs through light flashes. The pulsed ion chamber operates based on ionization principles, measuring charged particles in a gas-filled chamber, and may not directly analyze RDPs using the filter and light flash mechanism. An alpha track detector captures the tracks left by alpha particles in a special film over time and measures exposure indirectly, not relying on real-time light detection.

Thus, the scintillation disk stands out for its specific design and operation tailored for accurate measurement of radon decay products, highlighting its role in radon testing and measurement protocols.