sodium iodide scintillator

sodium iodide scintillator

[′sōd·ē·əm ′ī·ə‚dīd ′sint·əl‚ād·ər]
(nucleonics)
A sodium iodide crystal activated with thallium; used especially in the measurement of the energy of gamma rays, by measuring the amplitude of pulses of light generated by electrons in the crystal which are excited by the gamma rays.