Re: xray machines encapsulated

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

>I agree with Julian, if the question was directed at the vacuum in the x-ray
>tube. Is there another context to the question, perhaps a specific
>application or something the person had read or saw? I remember touring a
>CGR factory in Baltimore many years ago and we passed some large vacuum
>chambers containing high tension transformers. When I inquired about this, I
>was told it was the way gas was purged from the transformer oil.
>
>Phil Rauch
>Medical Physicist, DABR
>Henry Ford Hospital
>(313) 916-1383
>
>> -----Original Message-----
>> From: Julian Manders [SMTP:Manders@NUCUSA.COM]
>> Sent: Thursday, December 09, 1999 12:56 PM
>> To:   MEDPHYS@cwis-20.wayne.edu
>> Subject:      Re: xray machines encapsulated
>>
>> >  >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?
>>
>> Same reason cathode ray tubes in your TVs and monitors, wave guides in
>> your
>> linacs, old radio tubes (among other examples) have vacuums in them.  The
>> system shoots electrons across a gap from a negative electrode to a
>> positive
>> electrode.  Air molecules get in the way.
>>
>>
>> Julian Manders
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