The radioanalytical procedures for the determination of neutron activation
isotopes (Fe-55 and Ni-63) in environmental samples (water, sediment, sail
and biological material) are described. The procedures are based on the cop
recipitation of Fe-55 with iron hydroxide in natural and reactor water, ash
ing and mineralization of sediments, soil and biota samples, and the sequen
tial separation and purification of the iron and nickel on anion exchange r
esin. The separated elements are electroplated onto copper discs and activi
ty of Fe-55 and Ni-61 is measured by beta spectrometry using anti-coinciden
ce Geiger-Muller gas flow counter.