Method for producing magnetic resonance cells

摘要

A method for making a magnetic resonance cell. Two elongated tubes communicate through orifices with the cell which is surrounded by an oven. One tube contains an ampoule prefilled with a barium film. The other tube has a necked-down portion or seal-off region and an enlarged portion. The enlarged portion has two branches, the first axially aligned with the necked-down portion and the second disposed at an acute angle with respect to the first. A wax carrier is in the first branch and an ampoule containing cesium is in the second. Vacuum pumps evacuate the cell and tubes, after which evacuation the cell is heated. Moving the wax carrier into the necked-down portion of the tube allows the wax to evaporate into the resonance chamber of the cell. After removing the wax carrier from the necked-down portion, one positions the cesiumfilled ampoule in the necked-down portion. The necked-down portion is then heated and sealed to remove the cell and ampoules from the vacuum system. Breaking the ampoules allows the barium to act as a getter and the cesium to escape. The cesium-filled ampoule and necked-down portion may be removed by heating and sealing the necked-down portion at its point of connection to the cell.