ANSWER:
Methods for the Separation of Isotopes:
Isotopes have different physical properties, so they can be separated by the methods based on these properties. Some of these methods are:
1) Gaseous diffusion
2) Thermal diffusion
3) Electromagnetic separation
4) Laser separation
(Ref. An Insight Into Objective Chemsitry-11, Ch-01, Q. No. 26)