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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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