Re: Thorium Oxide - Where could I buy small quantity?
From: Uncle Al (UncleAl0_at_hate.spam.net)
Date: 11/16/04
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Date: Mon, 15 Nov 2004 17:51:22 -0800
"Mr. Marcio Moraes" wrote:
>
> Hello
>
> I am developing medium pressure mercury lamps and in order to protect
> the electrodes and increase its life it is necessary to coat them with
> thorium oxide.
>
> In Brazil it is not easy to find this material. Could some one tell me
> where could I buy small quantities, in powder, of thorium oxide?
Do you need a bottle of powder or a sputter source?
http://www.strem.com/
Strem chemicals
90-3500 ThO2, 10g/$(US)80, 2x25g $(US)319. You might want to calcine
the nitrate.
Electrodes? Why? You'll get huge IR emission. Stick a suitable
amount of mercury in a heavy-walled fused silica tube, pump down, and
flame seal. Put it in a microwave cavity and blast away. Either way,
uou can broaden ad smooth the spectrum by doping with lanthanide
iodides. You increase lamp efficiency by jiggling the Hg isotope
ratio to lessen self-absorption. Photons are expensive - generate
them efficiently (then boast about it to your customers).
-- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf
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