Hi Matt
Thanks for the info. Where do you have to Mo crucibles from and what size
are they ? Do they fit in the old Mod. Ltd furnaces ?
Cheers
Nick
At 08:33 12/10/01 -0600, you wrote:
>The NMGRL long ago stopped using ion pumps on the extraction line due
>to high background problems. The MAP-215 still has the Tri-ode ion
>pump provided by MAP and has not had any background problems. At
>UCLA (when I was there) the VG3600 had a Starcell and there was never
>a background problem, however on the extraction lines the Starcells
>were a problem. We here at New Mexico are very happy with our Varian
>V-70 turbo pumps for all parts of our extraction line.
>
>Modifications Limited is marketing Nb crucibles in place of the too
>expensive Ta crucibles. We tested a Nb crucible for a day and found
>it acceptable, however never put it through a good workout. We will
>continue to use the Mo crucibles which have served us so well during
>the past several years. They have low blank, are very durable, and
>cost effective.
>
>Matt
>
>--
>Matt Heizler
>NM Bureau of Mines and Mineral Resources
>NM Tech
>801 Leroy Place
>Socorro, NM 87801
>
>Office 505-835-5244
>Argon Lab 505-835-5271
>Main Office 505-835-5420
>FAX 505-835-6333
>http://geoinfo.nmt.edu/staff/mheizler/home.html
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