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Re: X-Ray vision

And I used to pass visible light through gold (white in, green
out). Gold had to be thin enough to keep the energy losses of
fission fragments ~negligible. Good old days and nights...

Leigh Palmer wrote:

In my graduate student days I used to pass far infrared radiation
through superconducting lead 'most every day. Of course the lead
was only about 70 angstroms thick!

Leigh