Aluminium-gold reference material for the k(0)-standardisation of neutron activation analysis
Gold is an excellent comparator material for the k(0) 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 by atomic absorption spectrometry and a relative standard deviation of the gold content of 0.25% was found (10 mg samples). Metallography revealed a homogeneous distribution of AuAl(2) particles. The alloy was certified as Reference Material CBNM-530, with certified gold mass fraction 0.100±0.002 wt%.
Bibliographic Reference: Paper presented: INTDS 15th World Conference, Santa Fé, California (US), Sept. 10-14, 1990
Availability: Available from (1) as Paper EN 35702 ORA
Record Number: 199011708 / Last updated on: 1994-12-02
Original language: en
Available languages: en