The window is fused silica. This is an obvious choice and one of very few UV 
transparent materials… old EPROMs used fused quartz windows.

 

Hmm… one wonders if a hacked and almost free UV detector could be made using an 
old EPROM? 

 

Perhaps one could write a lot of ordered data on the EPROM, then check the data 
after a timed exposure to Mills type cell, having placed the encased chip 
behind a pin-hole. The degree of randomness caused by exposure could serve as a 
calibration gauge. If nothing else, this could corroborate results obtained 
with one or more other cheap detectors, such a normal photocell with a high 
pass filter.

 

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