Plasma isotope separation based on ion cyclotron resonance

Experiments are analyzed that have been conducted in the USA, France and Russia to investigate isotopically selective ion cyclotron resonance (ICR) as a tool for isotope separation. Because this method runs into difficulties at low values of the relative isotope mass difference $\Delta M/M$, for some elements (for example, gadolinium) isotope separation still remains a problem. There are ways to its solution, however, as experimental results and theoretical calculations suggest.