of around 16.5 MeV in a cyclotron. The causes the endothermic reaction
: + -> + - 2.92 MeV

It can also be produced by fragmentation of by shooting high-energy at a target.

Carbon-11 is commonly used as a radioisotope for the radioactive labeling of molecules in positron emission tomography. Among the many molecules used in this context are the radioligands