Effect of 0.3mT-50Hz magnetic field exposure on rats' liver dielectric relaxation was studied. Animals were exposed similar to occupational workers 8h/day for periods from 1 to 4 weeks the exposure effects were monitored relative to the effect of exposure to high energy 6MeV standard dose of 1 rad. Dielectric relaxations in frequency range up to 8MHz carried out immediately for all animals from each group to examine bioelectrical changes in liver relative permittivity, conductivity, and dielectric loss. The results indicated significant difference in dielectric characteristics due to the counter-ion diffusion at frequency up to 1MHz, whereas frequency increased the shift unremarkably noticed. Unveil to the data of relative fraction of damage (RFD), it insight remarkable damage due to magnetic fields in a manner it should not be less important than high energy photons. Significantly, animals of 1 week magnetic field exposure showed maximum damage effect by 15%, 26% and 5% damage in relative permittivity, conductivity and dielectric loss respectively more than 6MeV photons exposure. Relative to unexposed group the samples from 1 week magnetic field exposure confirmed liver bioimpedance results and indicated significant increase in enzymatic levels by 20.6%, 17.1%, 3.32% and 13.1% for SGOT, SGPT, TP and MDA respectively. The former results may reflect the animal body self-adaptation as exposure period increased. It is worthy to mention that this work is an important one that correlates between the effects of both extremely low frequency fields and ionizing radiation.