Dynamic properties on 99Mo adsorption and 99mTc elution with alumina columns

Abstract The Mo adsorption/ 99m Tc elution properties of alumina used as Mo adsorbents are examined for the development of 99 Mo/ 99m Tc generators using 99 Mo produced by the (n, γ) method. MoO 3 is irradiated by the Kyoto University Research Reactor (KUR). The alumina columns are filled with three types of alumina made from different raw materials. In this paper, elongated tubes are used as columns and the properties under Mo dynamic adsorption conditions on alumina are compared with those under static adsorption conditions. The results obtained suggest that the 99 Mo/ 99m Tc ratio specified by the Minimum Requirements for Radiopharmaceuticals of Japan (MRRP) is greatly affected by the method of adsorbing Mo on alumina.