EESA10H3 Lecture 6: EESA10 Lecture 6-11.doc
10 Sep 2013
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Document Summary
Radiation and human health: background radiation, natural radioactivity in the earth and by cosmic rays from outer space, cannot be controlled, manmade radiation, x-ray machines, x ray diagnostic, television sets, microwave ovens, radar devices, lasers, can be controlled. Ionizing radiation is radiation composed of particles that individually carry enough kinetic energy to liberate an electron from an atom or molecule, ionizing it. Ionizing radiation is generated through nuclear reactions, either artificial or natural, Increase levels of exposure make these effects more likely to occur but do not influence the type or severity of the effect: cancer- uncontrolled growth of cells, changes in dna- mutations. Damage at the cellular or molecular level. Teratogenic (fetus most sensitive in 8-15 week of pregnancy, smaller head or brain size, poorly formed eyes, mental retardation) Genetic (passed from parent to child: non-stochastic health effects - acute. Mile island"s accident: radiation cause skin cancer, observation.
