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[en] A method is described for the determination of uranium ores, siliceous materials, and solutions. As the matrices of all these materials can vary considerably, a modified background-ratio technique that uses an empirically determined exponent is used to correct for matrix effects, and yields linear calibration curves for U3O8 in briquette form of up to 1000 p.p.m. A background reading taken at 35,0 degrees 2 theta was found to be less subject to interference than the background at 36,70 degrees 2 theta. The relative standard deviation for the method ranges from 0,03 to 0,04 for concentrations of U3O8 from 400 to 4000 p.p.m. Differences between determined and accepted values for reference samples were found to be less than 1% over this range of concentrations. The calculation and evaluation of empirical exponents and the listing of a computer programme are given in the Appendices
[af]
Daar word 'n metode beskryf vir die bepaling van uraan in ertse, silikahoudende materiale en oplossings. Aangesien die matrikse van al hierdie stowwe heelwat kan verskil, word daar van 'n gewysigde agtergrondverhoudingtegniek met 'n empiries bepaalde eksponent gebruik gemaak om vir matrikseffekte te korrigeer en dit gee lineere kalibreerkrommes vir U3O8 in biketvorm van tot 1000 d.p.m. Daar is gevind dat 'n agtergrondlesing wat by 35,0 grade 2 theta geneem is, minder aan interferensie onderhewig is as die agtergrond by 36,70 grade 2 theta. Die relatiewe standaardafwyking vir die metode wissel van 0,03 tot 0,04 vir U3O8-konsentrasies van 400 tot 4000 d.p.m. Daar is gevind dat die verskille tussen die bepaalde en aanvaarde waardes vir verwysingsmonsters oor hierdie konsentrasiebestek minder as 1% was. Die berekenings en evalueering van empiriese eksponente en die lysting van 'n rekenaarprogram word in die aanhangsels aangegeeSource
18 Sep 1979; 10 p; ISBN 0 86999 470 0; 