What does the photocathode layer in a scintillation detector convert?

The photocathode layer in a scintillation detector is designed to convert light into electrons. When ionizing radiation interacts with the scintillator material, it produces flashes of visible light. The primary function of the photocathode is to absorb these light photons and emit electrons in response. This process is crucial in the operation of scintillation detectors, as the electrons produced can then be amplified and processed to yield a measurable signal that corresponds to the intensity of the original radiation.

This transformation of light to electrons is central to the functioning of numerous radiation detection systems, making it a vital component in applications ranging from medical imaging to nuclear safety. Understanding this conversion process is essential for grasping how scintillation detectors operate and how they can be calibrated for accurate measurements.