A comparative study between the exposures of 6MeV photons and 0.3 mt-50 Hz magnetic fields in rat's liver

الملخص EN

Effect of 0.3 mT-50Hz magnetic field exposure on rats' liver dielectric relaxation was studied.

Animals were exposed, similar to occupational workers, to 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, up to 8MHz, were carried out immediately for all animals from each group to examine bioelectrical changes in liver relative permittivity, conductivity, and dielectric loss.

The results indicated a significant difference in the dielectric characteristics due to the counter-ion diffusion at frequencies up to 1MHz, whereas increasing the frequency results in an unremarkable shift.

The data revealed that the relative fraction of damage (RFD)is remarkable damage due to magnetic fields in a manner that it should not be less important than high energy photons.

Significantly, animals of 1 week magnetic field exposure showed a maximum damage effect by 15%, 26% and 5% damage in relative permittivity, conductivity and dielectric loss respectively more than 6MeV photons exposure.

To further characterize damages and speculating possible effects in liver tissue, the enzymatic levels of serum glutamic oxaloacetic transaminases (SGOT), serum glutamic pyruvic transaminases (SGPT), total protein (TP) content, and Malondialdehyde (MDA) were monitored.

In the same trend, the enzymatic levels recorded an abnormal increase attributed to the hepatic structural changes and tissue injury.

In comparison to the unexposed group, the samples from 1-week magnetic field exposure confirmed liver bioimpedance results and indicated a significant increase in the 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.