Radioactivity of the vanadium-alloy induced by D-T neutron irradiation

In order to evaluate the induced activity of the V-alloy, DT irradiation experiments were performed for the V-alloy prepared by NIFS, US DOE and SWIP. The radioactivities were evaluated as a function of the cooling time. The dominant radioactive nuclei are the 51Cr for 4-200 d, 46Sc for 200-1200 d, the 57Co and 54Mn for a cooling time of over 1200 d after 151 h irradiation. Radioactivities of 57Co and 54Mn in the specimen by NIFS are 2-8 times smaller than those by other sources. From the induced activities, impurity concentrations can be clarified. It can be confirmed that the impurity concentration of Al in the ingot by NIFS is lower than the targeted number