Answer:
The correct answer is scintillation counter.
Step-by-step explanation:
Scintillation counter refers to an apparatus, which is used for measuring and determining the ionization radiation with an application of the incident radiation's excitation effect on a scintillating substance, and determining the out-coming light pulses.
It comprises of a sensitive photodetector, generally a photo-multiplier tube, a scintillator that produces photons after coming in contact with the incident radiation, a CCD or charge-coupled device that transforms the light to an electrical signal and electronics to process the signal.