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OKA-2稀土釷礦石成分分析標(biāo)準(zhǔn)物質(zhì)Rare Earth-Thorium Ore

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.
Certified Values and 95% Confidence Intervals
Constituent  
Thorium 2.893 ± 0.058 wt%
Uranium 218.6 ± 8.2 μg/g
Approximate Chemical Composition
Component %
RE2O3 + Y2O3 33.51
CaO 25.32
SiO2 14.72
P2O5 8.93
Fe2O3 5.83
ThO2 3.292
F 1.28
MgO 1.24
Al2O3 0.82
SrO 0.66
MnO 0.52
ZnO 0.55
NiO 0.16
TiO2 0.62
Na2O 0.36
C 0.32
U3O8 0.02582
Sum of values for rare earth oxides determined individually.
Certifiable values from interlaboratory measurement program.
Provisional Values and 95%onfidence Intervals
Constituent Mean wt %± 95 % C.I
La2O3 5.6 ± 0.3
CeO2 14.3 ± 0.9
Pr6O11 1.8 ± 0.2
Nd2O3 6.7 ± 0.6
Sm2O3 1.0 ± 0.1
Eu2O3 0.26 ± 0.03
Gd2O3 0.58 ± 0.10
Tb4O7 0.06 ± 0.01
Dy2O3 0.17 ± 0.05
Ho2O3 0.020 ± 0.009
Er2O3 0.06 ± 0.06
Tm2O3 0.002 ± 0.002
Yb2O3 0.011 ± 0.005
Lu2O3 0.0013 ± 0.0005
Y2O3 0.32 ± 0.07
Sc2O3 0.004 ± 0.001
K 0.34 ± 0.02