Experiments on induced radioactivity characteristics of vanadium alloy

Induced radioactivity characteristics of vanadium alloys irradiated with 14 MeV neutrons were investigated. Short and long 14 MeV irradiation modes we re employed to distinguish the characteristic of radioisotopes according to their half-lives. Radioactivities in several different V-alloy samples wer e measured by the gamma-ray spectrometry. Along with the radionuclides indu ced in the major constituents, those from impurities were simultaneously id entified by the activation analysis. The decay profiles of the induced radi oisotopes were compared with the calculation using the comprehensive activa tion cross section libraries of FENDL/A-2,.0 and JENDL-ACT96. From the rati os of calculation and experiment (C/E), it was proved that the FENDL/A-2.0 and JENDL-ACT96 are adequate to predict the dominant radionuclide in V, Ti, and Cr. However, there was significant underestimation for activation prod ucts of impurities of Si, Fe, Ni, Nb and possibly Mo. In particular, the am ounts of Nb impurity, which ranges from 70 to 100 ppm, is almost the same a s that of the chemical analysis.