Rapid Flow-Based System for Separation of Radioactive Metals by Selective Complex Formation

Area of Science:

• Radiochemistry
• Analytical Chemistry
• Medical Physics

Background:

• Short-lived radioactive metals are crucial diagnostic tracers.
• Clinical production of radioactive metals yields trace amounts within large target metal quantities.
• Rapid and efficient isolation methods are essential for clinical applications.

Purpose of the Study:

• To develop a rapid and effective method for isolating trace radioactive metals from target metals.
• To implement a continuous flow-based system for selective separation.
• To optimize separation parameters for high purity and yield.

Main Methods:

• Selective complex formation using ethylenediamine-N,N,N',N'-tetraacetic acid (EDTA) ligand.
• Cation-exchange adsorption in a continuous flow, open-channel ion trap system.
• Optimization of channel dimensions, mesh, and flow rate for separation efficiency.

Main Results:

• Selective separation of radioactive Gallium (Ga) from Zinc (Zn) achieved with >99% efficiency.
• Reduced Zinc contamination to 2.3 μg/L in the Gallium solution.
• Demonstrated effective separation of trace Ga from a large excess of Zn (50 fg/L Ga to 100 mg/L Zn).

Conclusions:

• The developed flow system effectively and rapidly separates trace radioactive metals.
• The method utilizes selective complexation and cation-exchange in a unique flow configuration.
• This technique offers on-site applicability for clinical radioactive metal purification.