which process & which isotope u mention
1. nuclear reaction U235 & Pu239
U didn't mention which process
Yes, for the specified isotope; but the process is statistic.
Measuring the radioacivity of these isotopes can be tracked the course of a technological process because radioisotopes migrate themselves.
Vicram Prakash Singh has written: 'Separation of hydrogen isotopes by a flowing bed process' -- subject(s): Isotopes, Hydrogen, Isotopes separation
carbon dating
tracer
Radioactivity
I can't find it
Nuclear fission
radioactive decay
The separation of isotopes is relatively easy for light elements as hydrogen, lithium, nitrogen etc. For elements with higher atomic weight and a small difference between the atomic masses of the isotopes the process is long and expensive. The insignificant differences between these isotopes doesn't facilitate the separation.
True, only fissionable isotopes that produce enough excess neutrons to sustain a chain reaction can be used directly as fuel.However fertile isotopes that capture neutrons and then transmute to fissionable isotopes can be used indirectly as fuel through a process called breeding.