الفهرس 
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Abstract
Ionizing radiations produce deleterious effects in the living organisms. The major source of human exposure to natural radiation arises from the inhalation of radon ( Rn) gas. The present study was aimed to evaluate the effects of Rn inhalation on some biochemical and biophysical properties of blood. Also, the histopathological effect of Rn inhalation on some organs was studies. To carry out the required biological studies, 20 adult male albino rats with average weight 150 ± 10 gm were used as an animal model. The animal exposed to three different concentrations of the Rn and its daughters inside the Rn chamber using uranium ore stone to stimulate miners environmental conditions. The Rn concentrations are measured using CR-39 solid state nuclear track detector; it is a standard .tool for measuring Rn concentration. CR-39 etched in 6.25N -NaOH for 6 hours at 70 °C. The accumulated Rn doses received by animals over 3, 5 and 7 weeks were found to be i2-45, 4.09 and 5.72 WLM respectively (based on 12 exposure hours per week).
The results indicate that the blood viscosity, consistency index and yield stress increase with Rn doses. Also, Rn exposure leads to damage the RBCs membrane and enhances of aggregate formations. Moreover, alpha particles emitted from Rn change the mechanical properties of RBCs membrane (permeability and ”’. The result also indicated that disturbance in the
hematological and biochemical properties of blood have been occurred with Rn doses. The Rn inhalation caused damage structure in many organs, from which the lung and the testis are the most affected ones. It was concluded from the result that the Rn gas inhalation is harmful to biological systems and the degree of damage was dose-dependant.