Abstract
Two types of Egyptian cements: sea water cement and slag cement were examined for the elements inducing long-lived gamma radioactivity on irradiation in the reactor. A radiochemical separation procedure has been worked up, which is suitable for cement samples with high iron content. For quantitative determination of certain trace elements in cement by activation analysis, W-1 has been applied as a reference standard. Cement tagged with irradiated Sc
2O
3, ZnO or sea water cement has been recommended for location of cement tops and other investigations on oil wells.