Radioanalytical determination of Fe-55 and Ni-63 in the environmental samples

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.