Silver activated zinc-sulfide, ZnS:Ag, is a

free-flowing white fluorescent powder

with an exceedingly high scintillation

efficiency. It is primarily used for alpha

particle detection. The most common detector

format is a thin flat plate of inert glass or

plastic to which the ZnS:Ag is affixed in

a thin uniform layer on one side.

Such scintillating screens provide very

high intrinsic detection efficiency for alpha

particles while having very low sensitivity for

beta particles and gamma rays.

Technical Features