Abstract: The relationships between neutron irradiation damage parameters,
dose and He content, and the magnetic properties evaluated from the magnetic
curves measured by a new developed vibrating sample magnetometer were
investigated on type 316 stainless steel. A fast neutron reactor, JOYO, and a
thermal neutron reactor, JRR-3, were used for irradiation. In addition to
irradiation in each of the reactors, irradiations using the both of them, the
coupling irradiation, were also conducted in this study. Irradiation in
different reactor and especially the coupling irradiation enabled us to
evaluate the effects of dose and He content to the magnetic properties
individually in a wide irradiation damage range hardly obtained by irradiation
in only one reactor. As the result, it was revealed that the magnetic
parameters, especially magnetization at 0.5/μ _{0} A/m and
coercive force, have close relationships with dose. Furthermore, the comparison
with the result of tensile test showed that these magnetic properties are
related to irradiation hardening. On the other hand, any magnetic properties
investigated in this study are not dependent on He content. These results show
the possibility of nondestructive evaluation of dose and irradiation hardening
based on the magnetic properties.
