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Radiochemistry in Nuclear Power Reactors
E.3DETERMINATION OF IRON-55
E.3.1Principle of Analyses
This procedure is to determine the Fe-55 content in the presence of Fe-59 in water or solid samples. Iron isotopes Fe-55 and Fe-59 are separated from fission and corrosion products by ion exchange and organic extraction. The organic phase is then transferred into a counting vial containing toluene base scintillator cocktail. The sample is counted with a liquid scintillation detector.
E.3.2Separation and Purification Procedures
Fe carrier (10.0 mg/mL)
Co, Cs, Mn, Cr hold-back carrier (~10 mg/mL)
HCl—concentrated, IN, 6N, 9N
NaOH—IN and 3N
Anion resin—AG 1×10 50–100 mesh in chloride form
Bis(2-ethylhexyl) Hydrogen Phosphate
Buffer solution—pH 2.2
Dissolve 14.9 gm KCl in 1000 mL H2O, label as 0.2M KCl
Dilute 16.5 mL of conc. HCl to 1000 mL of H2O and label as 0.2N HCl
Mix 500 mL of 0.2M KCl with 78 mL of 0.2N HCl for buffer solution