Abstract
Special fast procedure for radiochemical extraction of carbon impurities from boron samples was developed. The procedure consists of alloying the sample in a mixture of KNO3+KOH at 600°C, dissolving of the cooled melt in water, and subsequent distillation of CO2 from the boiling acidic solution of HNO3. Time span of the whole procedure equals 25 min and provides more than one thousand-fold extraction of initial carbon impurity from the boron sample. Kinetics of the carbon extraction was measured with carbon-11 radiotracers which were induced in the investigated samples by the irradiation with 26 MeV bremsstrahlung.
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