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Re: health question

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>


I "believe" it takes 760 torrs to equal one atmosphere
of pressure @ Standard Temperature and Pressure (STP)
or 29.92"/Hg @ 0*C or 1013.25 mBars. Of course it ap-
pears that there is more than one definition for "STP" now
days. Acording to Onlineconversion.com, a "technical at-
mosphere" equals 28.959"/Hg @ 0*C or 980.665 mBars, so I suppose it depends on how you wish to define "1 atmosphere" or "1 Bar". Bottom line though is that the 25"/Hg that your vacuum pump can attain is only slightly
below ambient atmospheric pressure. Some of the strongest
hurricanes have eye pressures that approach 26"/Hg! You are
correct in your assumption that you received far more x-radi-
ation from your full mouth x-rays at your dentist than you ever
could, probably in a life time, by running high voltage through
your homemade vaccum tube if 25"/Hg is all of the vacuum that you can pump them down to. I think you're pretty "safe"
at least from an x-ray production point of view ;^)

David Rieben

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, February 04, 2006 1:51 PM
Subject: Re: health question

Original poster: "Neal Namowicz" <mr_neal@xxxxxxxxxxxx>
Hi guys, could someone please tell me how torrs equate to in/hg? That's how the gauge on my little pump measures vacuum, and yes, I have been running HV through my little home-made vacuum tubes. (If I pump enough, I can get down to around 25 in/hg) The plasma streamers are fascinating to watch, especially how they change as you continue to increase the vacuum on them. Yeah, I know about the potential for X-ray emissions, but I figured I was probably exposed to a whole lot more when I had a full mouth x-rays taken at the dentist's.
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, February 03, 2006 5:43 PM
Subject: Re: health question

Original poster: DRIEBEN@xxxxxxxxxxxxxxx

Oops, me open mouth, insert foot :^) For some reason,
I was mentally equating "torrs" to "millitorrs"! I think
we agree that it requires a very hard vacuum to generate
significant hard x-rays of several hundred kEVs and that's
what I was trying to say. Of course the Marx generator or
natural lightning is in another catagory and as you say, it
would apear that high POWER (not necessarily high ENERGY)
discharges seem to be able to generate some x-rays, even
at STP. Of course with lightning events in the upper levels
of the atmosphere, the discharges are occuring in at least
a partial vacuum.