xray machines encapsulated

["Alan E. Watts" <wattsa@oak.cats.ohiou.edu>]

Fellow listservites,

I was posed this question by a non-radsafer working at the us army
aberdeen proving ground: Why would xray machines be encapsulated
in a vacuum system?

Any ideas?

Alan Watts
RSO
Ohio University
wattsa@oak.cats.ohiou.edu
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