Gadolinium oxysulfide

The scintillator is the primary radiation sensor that emits light when struck by high energy photons.

There are two main disadvantages to this scintillator; one being the hexagonal crystal structure, which emits only optical translucency and low external light collection at the photodiode.

It is also used as a green phosphor in projection CRTs, though its drawback is marked lowering of efficiency at higher temperatures.

The crystal structure of gadolinium oxysulfide has Trigonal symmetry (space group number 164).

[4] An approved respirator should be worn if exposure to dust could occur when working with gadolinium oxysulfide.

Gadolinium oxysulfide should be stored away from mineral acids, strong oxidizers and flammable materials.