EN
The aim of the work was to detect in different tissues of hens the trace elements activated by irradiation with a stream of thermic neutrons, for determining their mutual qualitative and quantitative ratio in particular tissues. In view of too high activity for transport from the reactor, caused by radiation of isotopes with a short half-life, the samples had to be stored for 3 months for cooling, hence the quality of radioactive elements suitable for investigation had to be limited to those of long-life and emitting the gamma and beta rays, i.e. in the given case to caesium, zinc and cobalt.