Experiment on Induced Activities and Decay-Heat in Simulated D-T Neutron Fields: JAERI/USDOE Collaborative Program on Fusion Neutronics

An experiment of Induced radioactivity and decayheat has been conducted in the framework of JAERI/USDOE collaborative program on the fusion blanket neutronics. Sixteen different materials have been irradiated in two typical DT neutron fields simulating spectra at the first wall and blanket regions of a fusion reactor. Induced radioactivity production profiles for both short and long irradiation times were analyzed by detecting associated γ-ray energy spectra. Energy release rate in material was characterized on the basis of the γ-ray emission data measured as well as β-ray contribution estimated. In this experimental study, focuses were placed not only on providing benchmark data for verification of the calculation code and nuclear data, but also on a comparative study for providing a guide line for the material selection concerning the dose rate as well as the decayheat after shutdown in the near term DT fusion devices.