الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The word ”radiation” might make you think of disaster-filled science-fiction movies and mutant monsters, but the truth is radiation is a daily part of all of our lives. Radiation exists all around us. It is in our homes as part of our radios and microwave ovens, and we like all other creatures and objects on Earth) experience extremely low levels every moment from our natural environment . Most simply put, radiation is energy that travels through space as either waves or high speed particles. There are two types of radiation: non-ionizing radiation and ionizing radiation. Together these two types of radiation form the electromagnetic spectrum[.6]Ultraviolet (UV) radiation is a forms of electromagnetic radiation. The main source of UV radiation (rays) is the sun, Higher energy UV rays often have enough energy to remove an electron from (ionize) an atom or molecule, making them a form of ionizing radiation. Ionizing radiation can damage DNA in the cells in our body, which in turn may lead to cancer. But because UV rays don’t have enough energy to penetrate deeply into the body, their main effect is on the skin.[0].Radiations are naturally present in our environment and exist since the birth of this planet. It comes from outer space (cosmic), the ground (terrestrial), and even from within our own bodies. It is present in the air we breathe, the food we eat, the water we drink and in the construction materials used to build our homes.