^<175>Hfをトレーサーとして用いた中性子放射化分析法によるジルコニウム及びジルカロイ標準試料中のハフニウムの定量

概要

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Trace amounts of hafnium were determined accurately in reference materials of zirconium and Zircaloy by radiochemical neutron activation analysis using ^<175>Hf as a tracer for chemical recovery. The ^<175>Hf was produced by ^<175>Hf(γ, n) ^<175>Hf reaction in LINAC. The samples (50〜100 mg) and the portions of hafnium standard solution (0.01〜10μg Hf) were irradiated in JRR-2 or JRR-4 at a thermal neutron flux of (2.7〜8) × 10^<13>n cm^<-2> s^<-1> for 0.5〜265.5 h. After cooling for 7 days, the sample was dissolved with a precisely measured amount of 175Hf solution. Acidity of the sample solution was adjusted to 6 M with hydrochloric acid and 95Nb was extracted with α-benzoinoxime. Hafnium-181 and ^<175>Hf were separated by extraction chromatography using cyclohexanone adsorbed on Teflon powder as a stationary phase (8φ × 400 mm column) and ammonium thiocyanate-ammonium sulfate-hydrochloric acid as a mobile phase. Gamma-ray spectra of samples, standards, and ^<175>Hf standards were measured with a Ge(Li) detector. From the tracer intensity of 343 keV of ^<175>Hf, corrected for ^<175>Hf produced by (n,f) reaction during irradiation, chemical yield of hafnium was obtained. Hafnium contents were calculated from the corrected peak area of 482 keV of 181Hf. Satisfactory results were obtained for hafnium in reference materials of zirconium and Zircaloy.
社団法人日本分析化学会の論文
1984-06-05