It was written:
>An old "science project" book I read had you make an x-ray emitter
>from an ordinary lightbulb, by using the filament as the cathode (very
>High voltage supply) and a piece of foil on the outside of the bulb as
>the
...
>(modern lightbulbs aren't high vacuum anymore, are they?  They've
>got some sort of inert gas?)

I have loads of info on modern hospital-type x-ray tubes on my site.
Specifically -
http://www.geocities.com/CapeCanaveral/Hangar/6160/electric.html

I'm told that these days - lightbulbs contain a basically atmospheric
pressure dry nitrogen/argon mix...

-Bill the arcstarter
Starting arcs in Cinci, OH
http://www.geocities.com/CapeCanaveral/Hangar/6160


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