First, membrane conditioner, 0.5M HCl, flows through the membrane, activating it. The bismuth-213 adheres to the ion-exchange material, a solution of 0.005M HCl washes any remaining actinium solution from the material and returns it to the container where more bismuth-213 is created for future extraction. Next, the eluent, 0.1M sodium acetate, flows through the membrane, picking up the bismuth-213, and into the bismuth isotope collection container. Finally, air blows any remaining eluent from the membrane into the bismuth container. The membrane can be replaced or washed for reuse. The holding coil and other tubing are not wetted by aqueous solutions, so no residual reagents adhere to contaminate subsequent reagents. An air bubble is drawn into the tube before each reagent, further ensuring the solutions do not intermingle. The pump is a precision syringe pump. The pump does not become contaminated as the solutions are only drawn into the holding coil, not the pump.