What does the scintillator do?

• A. Converts x-rays to light
• B. Absorbs x-rays
• C. Produces electrons
• D. Emits heat

Answer: (A)

A scintillator acts as a light-producing transducer. When X-ray photons enter the material, their energy is absorbed and used to excite the atoms. The material then returns to a lower energy state by emitting photons in the visible (or near-visible) range. That light is what a detector converts into an electrical signal, allowing the X-ray information to be measured. So the essential role is converting X-ray energy into light, which the subsequent detector can read. While absorption happens, the key output is light emission, not directly producing electrons or significant heat.