EESA10H3 Lecture : Lecture note 6

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19 Jul 2010
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But the question is what type and how much radiation is there. Even if we are walking outside in the woods, we are still exposed to some radiation, because of background radiation: something that is produced and emitted from outer space. Natural radioactivity in the earth and by cosmic rays from outer space. It has existed for hundreds of thousands of years. Something that we can control is man made radiation (electronic devices, appliances, etc. ). (note: nowadays, engineers have found technologies to protect us from most of this radiation). Examples of some man-made devices that emit different types of radiation include: X-ray machines (different kind of equipment used in labs for analysis, for example, cca can also be detected using x-ray) X-ray diagnostic (x-ray used for diagnostic of different body parts) Slide 2 ionizing radiation exposure to the public: man-made radiation is just 18%.

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