This paper reports the investigations carried out on isotopic enrichment in boron oxide plasma produced by a Nd : glass laser giving 20 MW in 30 nsec (FWHM). Energy distributions of various ions in the plasma expandinginvacuumwere obtained with an electrostatic ion analyzer. Energies corresponding to peaks of distribution forB+10andB+11were found to be different by the ratio of their masses, consistent with hydrodynamic expansion of plasma. An anomalously high ratio ofB+10toB+11ions as compared to their natural abundance was observed.