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BL-4a鈾礦石成分分析標(biāo)準(zhǔn)物質(zhì)Uranium OreU：0.1248 ± 0.0007 wt % *

Description
BL-4a is intended as a replacement for BL-4 of which the stock is exhausted. It is ore typical of the property of Eldorado Nuclear Limited in Beaverlodge, Saskatchewan, and consists of pitchblende in reddish-brown mylonitized oligoclase saturated with dusty hematite.
The bulk material was dry-ground to minus 74 μm, blended in one lot and bottled in 200-g units. The homogeneity of BL-4a for uranium was confirmed by both neutron activation and fluorimetric procedures performed by two different commercial analytical laboratories.
Certification
The recommended value for uranium is the mean of single determinations for each of 25 bottles performed at CANMET by the volumetric umpire method.
Introduction for use
The recommended value for BL-4a pertains to an "as is" basis.
Legal notice
The Canadian Certified Reference Materials Project has prepared this reference material and statistically evaluated the analytical data to the best of its ability. The Purchaser by receipt hereof releases and indemnifies the Canadian Certified Reference Materials Project from and against all liability and costs arising out of the use of this material and information.
Reference
The preparation and certification procedures used for BL-4a are given in CANMET Reports 82-6E "BL-2a and BL-4a: Certified Uranium Reference Ores", 83-9E "Radium-226 in Certified Uranium References Ores DL-1a, BL-4a, DH-1a and BL-5" and 84-11E "Lead-210 in Certified Uranium Reference Ores DL-1a, BL-4a, DH-1a and BL-5" which are available free of charge on application.
Certified Values and 95% Confidence Interval
Constituent  
U 0.1248 ± 0.0007 wt % *
Ra-226 15.5 ± 0.5 Bq g-1
Pb-210 15.6 ± 0.5 Bq g-1
* standard deviation