[opendtv] Re: EU and CRTs
- From: Kilroy Hughes <Kilroy.Hughes@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 3 Oct 2006 17:20:34 -0700
SED doesn't contain radioactive materials (no more than a salt shaker anyway).
X-Rays are generated in CRTs because electrons are accelerated by 35 kev
typically, then decelerated by shadow mask and phosphor collision releasing
"braking radiation" (bremsstrahlung) in the form of X-ray photons corresponding
to some fraction of their kinetic energy.
SED displays use much lower voltage/acceleration, which is below the threshold
for producing significant X-ray output.
Kilroy Hughes
Sr. Digital Media Architect
Consumer Media Technology Group
Microsoft Corporation
________________________________________
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of negrjp
Sent: Tuesday, October 03, 2006 4:17 PM
To: opendtv
Subject: [opendtv] Re: EU and CRTs
Hi, All!
About CEE RoHs, a little question (it make sense like a joke):
How to blocking X-rays , Gamma Rays when to handle radioactive
materials without Lead Walls?
Jonas,
from Brazil
> Thanks!
>
> I, too, think SED is wonderful, but I first thought that about five
> years ago, when I first saw its pictures. How long will we have to wait?
>
> TTFN,
> Mark
>
>
> Jeroen Stessen wrote:
> >
> > Hi,
> >
> > Mark Schubin:
> > > I'm trying to get a handle on why the RoHS and WEEE are supposed to be
> > > putting an end to professional CRT-based monitors.
> >
> > If apparently it isn't for the lead contained in the glass (which
> > is in a very inert form anyway, and therefore relatively safe)
> > then it must be for something else. Maybe it's the lead in the
> > solder joints on the PCB, and the manufacturer has not yet switched
> > to a lead-free solder process. (Not so trivial.)
> > Or maybe it's the cadmium in the phosphors, I seem to recall that
> > when we switched to cadmium-free red phosphor the color point
> > deviated further from EBU-red. Or maybe it's something in the
> > shadow mask, or fire retardants in the cabinet, or ..., or ...
> > It could be any number of things, no point in guessing.
> >
> > This message seems to hint at a worthy successor to the CRT:
> >
> > http://news.com.com/2100-1041_3-6122031.html?part=rss&tag=6122031&subj=news
> >
> >
> > Greetings,
> > -- Jeroen
> >
> > +-------------------------------+------------------------------------------+
> > | From: Jeroen H. Stessen | E-mail: Jeroen.Stessen@xxxxxxxxxxx
> > |
> > | Building: SFJ-5.22 Eindhoven | Deptmt.: Philips Applied
> > Technologies |
> > | Phone: ++31.40.2732739 | Visiting & mail address: Glaslaan 2
> > |
> > | Mobile: ++31.6.44680021 | NL 5616 LW Eindhoven, the
> > Netherlands |
> > | Skype: callto:jeroen.stessen | Website:
> > http://www.apptech.philips.com/ |
> > +-------------------------------+------------------------------------------+
>
>
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