RADIONUCLIDE PRODUCTION WITH GREATER-THAN 70-MEV PROTON ACCELERATORS - CURRENT AND FUTURE-PROSPECTS

The role of proton accelerators (i.e. cyclotrons) in the production of medical radionuclides is increasing as a result of new trends in medical research and due to clinical needs associated with the expanding field of positron emission tomography (PET). Accelerators also produce radionuclides needed in single photon emission computerized tomography (SPECT). Modern high-intensity H- cyclotrons are now commercially available, allowing the use of simultaneous beams, as well as a highly reliable operation. Furthermore, new accelerator-based methods for the production of several useful positron emitters and for the large-scale production of Tc-99m and Mo-99, are being investigated. Based on new data, an ample supply for both PET and SPECT radiopharmaceuticals is feasible and may be obtained from centralized regional facilities operating a modern accelerator. For these facilities, an accelerator capable of delivering > 70-MeV protons is, by far, the best overall choice. This rationale is explained here and supported with a summary of radionuclide production data. An increasing role for modem proton accelerators in nuclear medicine and other applications is believed to be scientifically proven and forthcoming although further research and development of the technical and economical basis are required.