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REN R360 (25)
Lecture

Radiation.docx

2 Pages
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Department
Renewable Resources
Course Code
REN R360
Professor
Melanie Muise

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Description
Radiation  All around us  Cannot escape or control  It is a part of our planet 1. Background Radiation – it is natural radioactivity in the Earth and by cosmic rays from outerspace. It can lead to mutation but does not usually cause harm to humans 2. Manmade radiation – cause by electronic products and is harmful to the human health Some Sources:  X-rays machines  TV sets  Lasers  Microwaves These sources are controllable  Manmade Radiation is only 18% of all emitted radiations of which 4% is emitted from nuclear medicines (used to cure cancer)  Natural Radiation is 82% of all emitted of which 55% is emitted by Radon.  Radiation can be divided into 2 groups based on the amount of energy possessed by the radiation. 1. Ionized – High energy (cosmic, gamma rays, etc); it has short wavelengths. However, there is enough energy to break down chemical bonds and can harm our body. 2. Non Ionized – Low energy (TV, microwaves, etc); it has long wavelengths. There is not enough energy to rearrange chemical arrangement. The affects it has on human health is still debated by scientists. How does ionized radiation cause health effects?  Radioactive material that decay spontaneously producing ionizing radiation o Strip away electrons from atoms o Break some chemical bo
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