I have a XRAY shield which was
manufactured by Questar Part number 19370.
Curiously they call it a counter
It could be used to keep pesky beta
and alpha particles (not to mention
some low energy gamma rays) out of
Or you could use it as a counter
If you are planning to use it as a
XRAY shield for your telescope
the price is $1,000,000.
Otherwise, make an offer.
It for $90 now.
It went for $75 when I bought it.
A serial optec temperature compensated
focuser would do as a trade.