OKA-2 Certificate of Analysis

Certified Reference Material: Rare-Earth – Thorium Ore

OKA-2 was prepared from samples from a britholite deposit near Oka, Quebec. The britholite mineral has been described as thorium-bearing cerian silicate apatite. The samples were collected by the Radiation Geophysics Section, GSC in aid of an IAEA project to produce a gamma-ray spectrometry calibration standard for thorium measurements. The material was donated to CCRMP to prepare a reference material for thorium and rare earth elements, and as a source for the preparation of the IAEA material by silica dilution.

Twenty-seven laboratories in two separate measurement programs by CCRMP and IAEA provided analytical results for thorium, uranium, and potassium. Values for thorium and uranium are considered certifiable by CCRMP.

A copy of CANMET Report 86-154 (TR), "The certification of thorium and uranium in CCRMP reference material OKA-2", will be issued with each order of OKA-2.

1. Sum of values for rare earth oxides determined individually.
2. Certifiable values from interlaboratory measurement program.

For further information

CCRMP, CanmetMINING
555 Booth Street
Ottawa, ON K1A 0G1
Canada

Telephone: 343-543-6830
E-mail: Contact CCRMP

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