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Re: U to Th ratio in Columbium ores



As previously noted, the ratio will likely vary with the specific deposit, 
but the ratio in a niobium (as columbium is usually called) concentrate 
(pyrochlore) from one site  at which we were working was  about 9 to 1 
i.e.  about 0.9% Th and 0.1% U.  I don't recall the concentrate/ore  ratio, 
but since only physical concentration was used, the  Th/U ratio in the ore 
was presumably also 9 to 1.

Leo M. Lowe, Ph.D.
Associate, Senior Health and
Environmental Physicist

SENES Consultants Limited
121 Granton Drive, Unit 12
RICHMOND HILL, Ontario
Canada L4B 3N4
Tel:  (905) 764-9380
Fax:  (905) 764-9386
Email Address:  llowe@senes.on.ca
Web Site:  http://www.senes.on.ca/
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