EESA10H3 Final: EESA10 FINAL EXAM PREP - LECTURES 6-12 NOTES SUMMER 2016

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Lecture 6: radiation and human health: we cannot escape radiation, 1. Background radiation: natural radioactivity in earth by cosmic rays from outer space, cannot be controlled: 2. Manmade radiation: electronic products like x-rays, television sets, microwave ovens, radar devices, lasers and can be controlled. Background and manmade radiation: 1/8th manmade radiation, others natural, *from artificial sources, main source is medical. Ionized radiation vs. non-ionized: non-ionized radiation: low energy, not really considered harmful, but has become a. Ionized radiation have short wavelength but high energy concern in last few years. Health effects from exposure to radionuclides: 1. Stochastic health effects: chronic (by chance, long period of time) Long-term, low level of exposure, not certain pattern established. Increase levels of exposure makes these effects more likely to occur but do not influence type of severity of the effect, carcinogens (20 years) Ex. professional exposure to microwave or lab instrument: 2. Increases levels of exposure make these effects more severe.

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