Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!ingr!phil
From: phil@ingr.com (Phil Johnson)
Newsgroups: sci.electronics
Subject: Re: Cheap EPROM eraser?
Message-ID: <9750@ingr.com>
Date: 12 Apr 90 21:43:02 GMT
References: <1615@serene.UUCP> <9658@ingr.com>
Reply-To: phil@ingr.UUCP (Phil Johnson)
Organization: Intergraph Corp. Huntsville, Al
Lines: 23

>(1) Short wave length - such as germicidal lamps
>    These are fairly safe to view without a filter, such as eyeglasses.
>(2) Long wave length - such as EPROM erasers
>    These can cause severe damage to eyes if view directly without a filter.
>This is one of the first safety lessons taught when dealing with UV-based
>analytical instruments, such as UV spectrophotometers.

I should have had that second cup of coffee before posting this.  It is re-
versed.

Long wave length (near) UV is on the visible light side of the UV spectrum
and therefore has a lower energy potential (photon energy~= 4-8 ev at ~120-
700 nanometers).  Shot wave length (vacuum) UV is on the X-ray side of the
UV spectrum and has a higher and more harmful energy potential (photon
energy ~=8-120 ev at ~= 8-120 nanometers).

PLEASE NOTE: these values are approximate, so don't flame them.


-- 
Philip E. Johnson                    UUCP:  usenet!ingr!phil
MY words,                           VOICE:  (205) 730-8112
MY opinion!