Complete dissolution of [226Ra]BaSO4 precipitate was successfully performed using NaNO2 as a
reducing agent in acidic solution at room temperature. Results showed a significant effect of acid
and NaNO2 concentrations and temperature on the dissolution efficiency. The method was
successfully used for separation of radium from NORM scale samples from the petroleum
industry; sufficient volume reduction of NORM waste was achieved. The obtained 226Ra solution
was purified using two separation methods. The dissolution method can be of great interest in the
development of radiochemical analysis of radium isotopes.