A rapid method for α-spectrometric analysis of radium isotopes in natural waters using ion-selective membrane technology

An α-spectrometric method for the rapid determination of radium isotopes (223Ra, 224Ra and 226Ra) in environmental samples is presented. Using EmporeTM Radium Rad Disks complete separation of the target radionuclides is achieved. The high selectivity of these Rad Disks allows the straightforward use of 225Ra as yield tracer. Chemical yield is up to 92±9%. The chemical procedure can be accomplished within 5 h. α-Sources show energy resolution in the range of typically 26–40 keV (FWHM). Despite minimal thickness of the sources no significant radon (Rn) losses can be observed.