Re: strength of vacuum

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net> 

Mike,

Radiation damage is a cumulative process, and the general rule is to limit 
exposure to "As Low As Reasonably Achievable" (ALARA). There are many 
sources for regulatory limit information. Following is one that you may 
find useful (and it addresses your question about curies as well as rads, 
rems, sieverts, grays, etc.):
http://www.ccohs.ca/oshanswers/phys_agents/ionizing.html

Best regards,

-- Bert --
-- 
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Tesla list wrote:

>Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com>
>So what would be considered unsafe/dangerous? Is there a chart somewhere
>that gives a time exposure limit for so many rads (btw, what's a curie? I've
>seen that unit used on smoke detectors)?
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Sunday, November 02, 2003 3:54 PM
>Subject: Re: strength of vacuum
>
>  > Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net>
>  >
>  > Antonio and all,
>  >
>  > I've found that some elongated lamps that are intended for scroll lamps do
>  > indeed have a high vacuum instead of inert gas. The glass fluoresces a
>  > brilliant yellow-green color, especially if the filament becomes
>  > incandescent from field emission (with lots of electrons being emitted).
>An
>  > old antique light bulb I have does a similar thing, only the glass
>  > fluoresces a brilliant blue color. In either case, I could easily detect
>  > the presence of X-rays via a Geiger counter 8 feet away. Remember that
>  > distance is your friend (inverse square law), keep run times down, or,
>  > preferably, don't irradiate yourself at all... :^)
>  >
>  > Best regards,
>  >
>  > -- Bert --
>  > --
>  > --------------------------------------------------------------------
>  > We specialize in UNIQUE items! Coins shrunk by Ultrastrong Fields,
>  > Lichtenberg Figures (electrical discharges in acrylic), & Scarce OOP
>  > Technical Books. Stoneridge Engineering -- http://www.teslamania-dot-com
>  > --------------------------------------------------------------------
>  >
>  > Tesla list wrote:
>  >
>  > >Original poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
>  > >Tesla list wrote:
>  > >  > Original poster: John <fireba8104-at-yahoo-dot-com>
>  > >  >
>  > >  >   How many people do you think got more
>  > >  >   than the recommended dose of rads in the last year while
>  > >  > experimenting with standard vacuum light bulbs?
>  > >"Normal" lamps don't have high vacuum inside, but are actually filled
>  > >with an inert gas at low pressure. If in the experiments some corona
>  > >or similar light appears inside the bulb, there is no problem. But
>  > >if nothing appears, and worse, the glass fluoresces with a green
>  > >light, this is sign of X-ray generation. Some small lamps are said
>  > >to have high vacuum inside. I am not sure. Vacuum tubes certainly
>  > >have (Humm... VTTCs may be dangerous...).
>  > >Antonio Carlos M. de Queiroz
>  > >
>  > >.
>  >
>  >
>  >
>  >
>  >
>
>.