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Do you want to detect at wavelengths below 300nm?
window materials used in Electron Tubes photomultipliers are:
borosilcate glass
this is the standard, low cost, window material and is suitable for wavelengths
greater than 300 nm.
uv glass (W)
extends sensitivity down to 185 nm.
quartz(Q)
made from fused silica, this material transmits down to 160 nm.
magnesium fluoride (MgF2)
transmits uv radiation down to 110 nm.
sapphire (S)
used for metal ceramic photomultiplier windows
