Which statement describes the major difference between scintillation detectors and semiconductor detectors?

Which statement describes the major difference between scintillation detectors and semiconductor detectors?

• A. Scintillation detectors do not produce an electrical signal
• B. Scintillation detectors use a gas chamber
• C. Semiconductor detectors do not create visible light
• D. Semiconductor detectors cannot detect gamma radiation

Answer: (C)

The key idea is how the detector turns gamma energy into a usable signal. In scintillation detectors, the incoming gamma ray excites a scintillating material, which then emits visible light. That light is converted into an electrical pulse by a photodetector such as a photomultiplier tube. In semiconductor detectors, the gamma interaction directly creates charge carriers (electron-hole pairs) in the detector material, and the collected charge forms the signal without any light being produced. So, semiconductor detectors do not generate visible light as part of the detection process, which is exactly the described difference. The other statements aren’t accurate for describing the main distinction: scintillation detectors do produce a signal (via light to a photodetector), they don’t rely on a gas chamber as their defining feature, and semiconductor detectors can detect gamma radiation.

The key idea is how the detector turns gamma energy into a usable signal. In scintillation detectors, the incoming gamma ray excites a scintillating material, which then emits visible light. That light is converted into an electrical pulse by a photodetector such as a photomultiplier tube. In semiconductor detectors, the gamma interaction directly creates charge carriers (electron-hole pairs) in the detector material, and the collected charge forms the signal without any light being produced.

So, semiconductor detectors do not generate visible light as part of the detection process, which is exactly the described difference. The other statements aren’t accurate for describing the main distinction: scintillation detectors do produce a signal (via light to a photodetector), they don’t rely on a gas chamber as their defining feature, and semiconductor detectors can detect gamma radiation.