Aluminum gold reference material for the k0-standardization of neutron-activation analysis
Ingelbrecht, C × Peetermans, F Decorte, F Dewispelaere, A Vandecasteele, Carlo Courtijn, E Dhondt, P #
Elsevier science bv
Nuclear instruments & methods in physics research section a-accelerators spectrometers detectors and associated equipment vol:303 issue:1 pages:119-122
Gold is an excellent comparator material for the k0-standardisation of neutron activation analysis because of its convenient and well defined nuclear properties. The most suitable form for a reference material is a dilute aluminium-gold alloy, for which the self-shielding effect for neutrons is small. Castings of composition Al-0.1 wt.% Au were prepared by crucible-less levitation melting, which gives close control of ingot composition with minimal contamination of the melt. The alloy composition was checked using induction-coupled plasma source emission spectrometry. The homogeneity of the alloy was measured by neutron activation analysis and a relative standard deviation of the gold content of 0.30% was found (10 mg samples). Metallography revealed a homogeneous distribution of AuAl2 particles. The alloy was certified as Reference Material CBNM-530, with certified gold mass fraction 0.100 +/- 0.002 wt.%.