Scintillation Process

662 keV gamma strike crystal and energy is deposited. This energy from the crystal generate photons and deposited on Cathode.

Reflector-> MgO

OpticalWindow->Quartz

Crystal->NaI(Tl)

Cathode->Bailcali

NaI(Tl)-> PropertiesTaken->Get "https://www.berkeleynucleonics.com/nai-sodium-iodide"

Left: A single electron entered and created scintillation process, Right: no electron able to create scintillation as they were absorbed in Reflector.