Relative biophysical effects on rat's bone as result of high energy photons and magnetic fields exposures

Abstract

There is critical need to do a lot of experimental studies to calculate of the relative biological effects of non-ionizing radiation and comparing its effect with ionizing radiation to re-determine the safe exposure dose to non-ionizing radiation. This research is concerned with studying the relative fraction of damage (RFD) of the extremely low frequency electromagnetic fields (4kV/m-50 Hz) to high energy photons (6 MeV) on some biophysical properties of rats bone. In this regard, 100 male albino rats are used and divided into sub groups of 10 rats each. One group of animals was used as control group (unexposed group) and did not receive any treatment. Similar to occupational workers, four groups of animals were exposed 8h/day for periods from 1 to 4 weeks and were immediately sacrificed at the end of the exposure period. Four groups of animals exposed 8h/day for periods from 1 to 4 weeks and remained 45 days post exposure periods, then sacrificed. The last group of animals was exposed to a high energy dose of6 MeV of dose (1rad). Femur bone samples of each animal from all groups were collected and prepared for further biophysical investigations. In addition, RFD of magnetic fields exposures are calculated for each group relative to dose of 6 MeV-1 rad photons. Results of exposure to the electric field showed significant deterioration effect on the biomechanical parameters of femurs as a consequential defect of bone strength and bone quality as compared to the unexposed ones. Also, the results obtained from the groups that udergone a post exposure period of 45-days did not show amendment in bone biophysical characteristics, which means that permanent effects and chronic damage of bone tissues may have resulted. On the other hand, the RFD ratios illustrated that the effect of exposure to ELF EMF has no lower effect than the exposure to ionizing radiation and should not be underestimated.

Electromagnetic Radiation Hazards on Cellular Bioelectricity of Rats’ Blood

“…The animals were kept inside the chamber dimensions 100x30x35 cm 3 during the exposure period whereas the Al electrodes were covered by front fixed Perspex sheets of similar dimensions. It should be noticed that the Perspex material has a negligible effect on the field uniformity as reported elsewhere [18]. It is important to confirm that the reading of the measured electric field inside the chamber was 4kV/m.…”

Dielectric Behavior of Nano Lead - Nano Copper oxides Polyvinyl Chloride (PVC) Composites

“…The real part of permittivity (ε′) was found to be dependent on filler concentration, confirming the DC dielectric strength findings [4]. This research aims to improve the dielectric properties of polyvinyl chloride by manufacturing sheets of polyvinyl chloride injected with metal oxides such as lead oxide and copper oxide at different concentrations and then making comparisons to reach the best concentrations as well as injecting polyvinyl chloride with lead oxide and copper oxide [5] in the nanoscale to compare with the best previous concentrations to prove the effectiveness of nanotechnology in improving the dielectric properties [6], [7].…”

“…The dielectric constant, also known as relative permittivity, is a parameter that indicates the relative charge storage capacity of dielectrics in the presence of an applied electric field. The relative permittivity is one of the basic electrical properties of solids and it can be calculated from the electrical capacitance (Cp) for bulk (PbO and CuO), (PbO and CuO) NPs, pure PVC, pure PVC /bulk PbO, pure PVC /bulk CuO composites, and PVC / PbO, PVC / CuO nanocomposites at room temperature and frequency dependence of relative permittivity (έ) can be represented graphically in Figure (5). As a result of interfacial polarisation alone, the dielectric constant approaches a constant value with increasing frequency at high frequencies.…”

Electromagnetic Radiation Influences on Rheological Parameters of Rats’ Blood

“…Such exposures may cause several hazardous health consequences such as headache, fatigue, depression and hyperactivity [1]. In this regards, many studies were done for knowing the possible hazard effects attributed to these fields [2][3][4][5][6][7][8][9][10][11][12].…”