IPA: /ˈsɪn.tɪ.leɪ.tər/
KK: /ˈsɪn.tɪ.leɪ.tər/
A material that produces light when it is struck by high-energy particles or photons.
The scientist used a scintillator to detect the radiation from the experiment.
Scintillator → It is formed from "scintilla" (from Latin, meaning spark or particle) and the suffix "-ator" (meaning one who or that which). A scintillator is a device that produces light (or sparks) when it is struck by radiation.
Think of a 'spark' ('scintilla') being created by a device ('-ator') — that's why a scintillator is something that produces light when it interacts with radiation.