Practice question

Scintillation detection converts radiation energy into light bursts. Inorganic crystals like sodium iodide or organic fluors emit photons upon excitation by charged particles or gamma rays. These photons are very faint, requiring amplification. Photomultiplier tube consists of photocathode emitting electrons when struck by photon, followed by dynode stages multiplying electrons tenfold at each step, creating measurable current pulse proportional to incident radiation energy. Gas ionization counters collect charge directly, and autoradiography uses photographic film. Hence photomultiplier coupling is characteristic of scintillation counting systems.