Joints study in Skhaba region shows the existence two joint directions, principal dominant
NW-SE Joints from extension origin upper Cretaceous age, unrelated and older than faults
in studied area statistically, the presence of Calcareous filling in
the joints that is supported
the extension origin in the first phase. Secondary NE-SW joints from Miocen-Pliocen in
age, and from extension origin ,related to the formation of faults, most of them contain thin
iron crust in secondary phase.
Study of the general characteristics of Fractures in the central part of
the AL-Kabir AL- Shimali river basin showed the presence of
several main groups of Fractures with directions NE-SW _ NNESSW,
NW-SE , E-W.and showed increased fracture rate in
the
northern and southern parts of the study area, and that the spacing
between the Fractures close to the medium convergence (5-34) cm ,
also show a aperture ranged between (0.1-5.1) cm, where aperture
width was increased in southwest of Lake 16 October near Lattakia-
Kless fault .
this study aimed to evaluate and compare enamel
cracks caused by removing of the adhesive remnant post debonding
of the fixed orthodontic appliance.
Radon is a radioactive gas, occurring naturally as a decay product of uranium .Radon is the second cause of lung cancer according to EPA and WHO estimates. The presence of cracks plays a major role in transmission of radon from depth to the surface o
f the earth and steams it into the air.The leakage of radon from the foundation soils is usually the primary source of indoor radon pollution. Due to the growth of urban population in active tectonic regions and because tectonic activity is accompanied by an increase in radon concentration; the emission of radon in these regions and its leakage into houses will be higher thus,it becomes necessary to conduct researches in those regions and take appropriate preventive and corrective actions to reduce the presence of radon in the houses and in foundation soils.
The importance of this research comes from benefiting from measurements of the change of radon concentration and its implications from both Geotechnical and Geo-environmental aspects.
