Magnetic property change of the material embrittled by neutron irradiation

In order to assess the effects on the magnetic properties due to the defect in the material irradiated by fast neutron ranging 100-1018 n/cm2, the magnetic properties such as maximum magnetic induction, coercivity, remanence, Barkhausen Noise Amplitude (BNA), Barkhausen Noise Energy (BNE) and hardness were measured. It is shown that the magnetic properties and hardness do not change by the fast neutron irradiation under 1017 n/cm2, but the magnetic properties decrease and the hardness increases by the irradiation over 1017 n/cm2. Therefore, in this experiment, it is under stood that the magnetic properties decrease by the increase of hardness. This measurement method can be used to evaluate the neutron irradiation embrittlement nondestructively since the magnetic properties and hardness do change by the neutron irradiation over 1017 n/cm2 consistently