Various types of mineral and drinking waters have been tested for the simultaneous determination of 226Ra and 22SRa using 3M's EMPORE TM Radium Rad Disks. Both r adionuclides 226Ra and 228Ra were counted through their daughter products, 226Ra by the conventional radon emanation technique and 22SRa through its daughter 22SAc by using a proportional counter. 0.2 M diammonium hydrogen citrate adjusted by ammonia to pH 7.8 was used for radium stripping from the disk and 3.10 -4 M diammonium hydrogen citrate was used for actinium washing from the disk.