抄録
In the production and quality control of zirconium and its alloys, it is the most important problem to determine trace hafnium rapidly and accurately because of its high absorption cross section for thermal neutrons.
This paper describes the method for the determination of hafnium in reactor-grade zirconium and also in commercial grade zirconium.
The metal was converted into the oxide by chemical treatment. Sample electrodes were prepared by coating with a thin layer of oxide powder on the flat top of a 5 mmφ graphite rod. The analysis was performed with the 3.4-meter Ebert mounted grating spectrograph using Raiskii spark excitation.
Analysis of several unknown samples containing 100 ppm Hf, determined independently by other physical methods, showed good agreement. The precision was 3% for 0.20 to 5.00% Hf and 8% for 40 to 600 ppm Hf.
