Chromium, iron and copper were determined in niobium by radiochemical proton activation analysis (PAA). The main steps of
the technique involved the irradiation of the samples with 13 MeV protons, the post-irradiation decontamination of the sample
surface, a two-step separation procedure based on anion exchange from HF and HCl medium, and counting the separated indicator
radionuclides with a well-type NaI detector. For a 5-hr irradiation, limits of detection for chromium, iron, and copper were
0.2, 5.0, and 15 ppb respectively. The results obtained by this technique are compared with data obtained by radiochemical
neutron activation analysis (NAA) and atomic absorption spectrometry (AAS).
Two radiochemical neutron activation analysis techniques capable for the determination of Ag, Au, Cd, Co, Cr, Cs, Cu, Fe,
Hf, Ir, K, Mn, Mo, Na, Ni, Pd, Pt, Rb, Sc, Se, Ta, Th, Sn, W, Zn, and Zr in niobium via medium- and long-lived indicator radionuclides
were developed. They involve two different irradiation and cooling times as well as two different group separation schemes
based on extraction and ion exchange. The achievable limits of detection are between 10−7 g/g and 10−13 g/g. The techniques were applied to analysis of niobium of different purity grades. For a number of elements, the results
of these techniques are compared with those of other techniques.