scintillation-counter crystal

scintillation-counter crystal

[‚sint·əl′ā·shən ¦kau̇nt·ər ‚krist·əl] (nucleonics) A substance (a fluor, such as thallium-activated calcium tungstate) that emits a flash of light (scintillation) when contacted by a high-energy particle, for example, an alpha, beta, or gamma ray.