Measurement of long-lived isotopes in fusion materials

Neutron cross section measurements are reviewed for the production of long-lived isotopes in fusion reactor materials. Samples were irradiated at 14.5 to 14.8 MeV at the RTNSII facility. Long-lived reaction products were detected using gamma and x-ray spectroscopy, liquid scintillation spectrometry, and accelerator mass spectrometry. Radiochemical separations were performed for many samples prior to analysis. Results are summarized for reactions leading to 26Al (720,000 y), 53Mn (3,700,000 y), 55Fe (2.73 y), 63Ni (100 y), 59Ni (76,000 y), 91Nb (700 y), and 94Nb (20,300 y). 17 refs., 2 figs., 4 tabs