A material that absorbs x-ray energy and emits part of that energy as visible light is called:

A material that absorbs x-ray energy and emits part of that energy as visible light is called:

• A. Diode
• B. Scintillator
• C. TFT
• D. Cathode

Answer: (B)

The main idea is how certain materials convert x-ray energy into light. A scintillator is a material that absorbs x-ray photons and re-emits part of that energy as visible light. This light can then be detected by photodetectors or TFT-arrays in indirect radiography systems. That combination—absorbing x-rays and producing light—is what defines a scintillator. The other items describe different devices or roles: a diode is a current-control device, a TFT is a readout transistor, and a cathode is an electrode in vacuum tubes. Thus, the material described is a scintillator.

The main idea is how certain materials convert x-ray energy into light. A scintillator is a material that absorbs x-ray photons and re-emits part of that energy as visible light. This light can then be detected by photodetectors or TFT-arrays in indirect radiography systems. That combination—absorbing x-rays and producing light—is what defines a scintillator. The other items describe different devices or roles: a diode is a current-control device, a TFT is a readout transistor, and a cathode is an electrode in vacuum tubes. Thus, the material described is a scintillator.