Isotope production system having a target assembly with a graphene target sheet

An isotope production system comprising:

• a particle accelerator configured to generate a particle beam, the particle accelerator including a stripper foil;
• and
• a target assembly including a target body having a production chamber and a beam cavity that is adjacent to the production chamber, the production chamber including a target material, the beam cavity opening to an exterior of the target body and being configured to receive a particle beam that is incident on the production chamber, the target assembly also including a target sheet positioned to separate the beam cavity and the production chamber, the target sheet having a side that is exposed to the production chamber, the target material is positioned in the target body and is in contact with the target sheet during isotope production,
• wherein the target sheet comprises graphene, and
• wherein the target sheet is at least 15 times thicker than the stripper foil.