Target assembly and isotope production system having a grid section

A method of generating radioisotopes, the method comprising:

• providing a target material into a production chamber of a target assembly, the target assembly having a beam passage that receives the particle beam and permits the particle beam to be incident upon the target material, wherein the target assembly also includes first and second grid sections that are disposed in the beam passage, each of the first and second grid sections having front and back sides, the back side of the first grid section and the front side of the second grid section abutting each other with an interface therebetween, the back side of the second grid section facing the production chamber;
• and
• directing the particle beam onto the target material, the particle beam passing through a foil that is positioned between the first and second grid sections at the interface, each of the first and second grid sections having interior walls that define grid channels through the first and second grid sections, respectively, the particle beam configured to pass through the grid channels toward the production chamber, the interior walls of the first and second grid sections engaging opposite sides of the foil.