How are light pulses from the Charcoal Liquid Scintillation measured?

The light pulses from the Charcoal Liquid Scintillation are measured using a Photo Multiplier Tube (PMT). PMTs are highly sensitive devices that convert light photons into an electrical signal, making them ideal for detecting the weak light emissions produced during the scintillation process. When radon decay products interact with the charcoals in the scintillation process, they produce light flashes. The PMT amplifies these flashes, enabling the quantification of the radioactive events. This amplification is crucial because the signals generated during scintillation can be very weak and would be difficult to analyze directly without this sensitive detection equipment.

Other options, such as voltage meters and optical sensors, do not have the necessary sensitivity or the specific function required for measuring the low-level light emissions typical in scintillation counting. Photodiodes, while capable of detecting light, do not provide the same level of amplification as PMTs, making them less effective for this application. Thus, the Photo Multiplier Tube is the correct choice for accurately measuring the light pulses from the Charcoal Liquid Scintillation process.