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The solubility of radium nitrate in concentrated HNO3 solutions was determined. The radium nitrate solubility decreases from ∼1 × 10−3 to ∼2 × 10−5 M as the HNO3 concentration is increased from 13.5 to 22 M. The solubility of radium nitrate in the examined range of HNO3 concentrations is 3–6 times higher than the solubility of barium nitrate under similar conditions.
It is shown that Y2O3, YF3, LaF3, and CeF3 help concentrate 90Y from seawater. To determine 90Sr, YF3 is the best reagent because the effect of interfering lead and thorium radioisotopes is minimum in this case. It is proposed to preconcentrate 210Bi on PbS to eliminate its interference. To determine 90Sr we measure the Cherenkov radiation of 90Y concentrated on YF3 without prior elution.
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