EESA10H3 Lecture Notes - Lecture 6: Heart Rate, Electric Field, National Cancer Institute
7 Mar 2018
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Document Summary
Radiation and human health: we can not escape radiation, background radiation - natural radioactivity in the earth and by cosmic rays from outer space. Can not be controlled: manmade radiation - electronic products: 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 exposures 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. Stochastic health effects: changes in dna- mutations. Teratogenic (fetus most sensitive in 8-15 week of pregnancy, smaller head or brain size, poorly formed eyes, and mental retardation) Genetic (passed from parent to child: cancer- uncontrolled growth of cells.
