EESA10H3 Lecture Notes - Lecture 6: Microwave Oven, Background Radiation, Radiography
15 Mar 2018
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Eesa10 - lecture 6 - radiation & human health. We can not escape radiation: background radiation - natural radioactivity in the earth and by cosmic rays from outer space. Comes from the ground & space etc: manmade radiation - electronic products. Radiation and human health: ionized radiation, non-ionized radiation. How does ionized radiation cause health effects: radioactive material that decay spontaneously produce ionizing radiation. Strip away electrons from atoms (create two charged ions) Breaks some chemical bonds: alpha, beta particles, gamma and x-rays (differ in the amount of energy they have) Health effects from exposure to radionuclides: stochastic health effects (chronic) Increase levels of exposure make these effects more likely to occur but do not influence the type or severity of the effect: non-stochastic health effects (acute) Increase levels of exposure make these effects more severe. Teratogenic (fetus most sensitive in 8-15 week of pregnancy, smaller head or brain size, poorly formed eyes, and mental retardation)
