EESA10H3 Lecture Notes - Lecture 6: Tumor Suppressor Gene, Microwave Oven, Background Radiation
26 Feb 2018
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Ionized radiation: high energy, short wavelength, non-ionized radiation, low energy, long wavelength, 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: people with this exposure has a chance of getting cancer, non-stochastic health effects -- acute: Increase levels of exposure make these effects more severe. Background exposure is significantly more dangerous than a single chest x-ray: the effect of different doses of radiation of the human body after acute, whole-body exposure: In 1910, scientists observed that radiation causes skin cancer: uranium miners, medical treatments, children more sensitive because they are growing more rapidly.
