Which detector uses a material that emits visible light when interacting with radiation?

Which detector uses a material that emits visible light when interacting with radiation?

• A. Semiconductor detector
• B. Scintillation detector
• C. Ionization chamber
• D. Photographic film

Answer: (B)

In a scintillation detector, the detector material itself emits visible light when it absorbs energy from radiation. This light is produced as the excited atoms return to their ground state after being struck by radiation. That light is then picked up by a light-sensing device (like a photomultiplier tube or photodiode) and converted into an electrical signal for measurement. This light-emission property is what sets scintillation detectors apart. Other detectors operate differently: semiconductor detectors rely on the creation and collection of electron-hole pairs without emitting light; ionization chambers measure the current from gas ionization rather than producing light; photographic film records a chemical change in the film after exposure, not light emission from the material itself.

In a scintillation detector, the detector material itself emits visible light when it absorbs energy from radiation. This light is produced as the excited atoms return to their ground state after being struck by radiation. That light is then picked up by a light-sensing device (like a photomultiplier tube or photodiode) and converted into an electrical signal for measurement. This light-emission property is what sets scintillation detectors apart.

Other detectors operate differently: semiconductor detectors rely on the creation and collection of electron-hole pairs without emitting light; ionization chambers measure the current from gas ionization rather than producing light; photographic film records a chemical change in the film after exposure, not light emission from the material itself.