Synthesis and characteristics of high-performance Mo adsorbent for Tc-99m generators

To further increase the Mo adsorbing capacity of Mo adsorbent (hereinafter abbreviated as PZC) which are synthesized by using zirconium tetrachloride (ZrCl4) and isopropyl alcohol, the chlorine atom concentration was increase d in the PZC. As a result, the Mo adsorbing capacity of the PZC was found t o increase from the conventional 200 mg to 250 mg/g-PZC. Since the PZC adso rption capacity depends on the ratio of adjacent chlorine atoms in the PZC molecules, the mechanism with which the PZC adsorbs the Mo is thought to be one of chemical adsorption backed by chemical reaction between the two adj acent Zr-Cl bonds and MoO42-. Since the PZC having high Mo adsorption shows more adsorption than an estimated value, the effect of Mo polyions cannot be ignored. The Tc-99m elution yield of the Generator was measured using the PZC which adsorb Mo including 1 to 470 MBq Mo-99. The PZC was filled within a glass c olumn with glass filter. The elution yield was found to be stable in the va lues ranging from 75-90% in each case. No increases in break-through of 99M o were observed even by adsorbing Mo-99 at 470 MBq, thereby it suggests tha t the PZC is kept stable, not being decomposed even under the condition of high radioactivity.