Which detector typically uses scintillation light produced by ionizing radiation to measure energy?

Which detector typically uses scintillation light produced by ionizing radiation to measure energy?

• A. Ionization chamber
• B. Geiger-Muller counter
• C. Scintillation detector
• D. Semiconductor detector

Answer: (C)

Energy from ionizing radiation is converted into light in a scintillator, and that light is then turned into an electrical signal to measure how much energy was deposited. The amount of scintillation light produced is roughly proportional to the energy deposited in the material, so the detector’s output (often after a photomultiplier tube or photodiode converts the light to a pulse) reflects the energy of the radiation. This chain—energy → light → electrical signal—lets you determine energy spectra and peaks. Other detectors work differently. An ionization chamber collects the charge from ion pairs created in gas, which tells you about the rate of radiation (activity) but not detailed energy. A Geiger–Müller counter mainly detects and counts individual events with little to no information about energy. A semiconductor detector measures energy by collecting charge from electron–hole pairs in a solid, without relying on light emission. The key feature of scintillation detectors is using scintillation light as the intermediary to gauge energy, which is why they’re the correct choice here.

Energy from ionizing radiation is converted into light in a scintillator, and that light is then turned into an electrical signal to measure how much energy was deposited. The amount of scintillation light produced is roughly proportional to the energy deposited in the material, so the detector’s output (often after a photomultiplier tube or photodiode converts the light to a pulse) reflects the energy of the radiation. This chain—energy → light → electrical signal—lets you determine energy spectra and peaks.

Other detectors work differently. An ionization chamber collects the charge from ion pairs created in gas, which tells you about the rate of radiation (activity) but not detailed energy. A Geiger–Müller counter mainly detects and counts individual events with little to no information about energy. A semiconductor detector measures energy by collecting charge from electron–hole pairs in a solid, without relying on light emission. The key feature of scintillation detectors is using scintillation light as the intermediary to gauge energy, which is why they’re the correct choice here.