EESA10H3 Lecture Notes - Lecture 6: National Council On Radiation Protection And Measurements

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We can not escape radiation: background radiation - natural radioactivity in the earth and by cosmic rays from outer space. Radon is a gas which affects us so much (55% radiation) Ionised radiation: so much energy that can change atoms of some other chemicals. They can push out electrons out of their atoms and produce ionized form of electrons. Non-ionized radiation: low energy radiation (high wavelength). Don"t have enough energy to remove electrons from the atoms. _ radioactive material (uranium etc) that decay spontaneously produce ionizing radiation. _ strip away electrons from atoms (create two charged ions) _ alpha, beta particles, gamma (very dangerous) and x-rays (differ in the amount of energy they have) Health effects from exposure to radio nuclides: stochastic health effects - chronic, long term, low level of exposure (if higher levels: severity won"t changewill be the same) Three mile island, pennsylvania, 1979: radiation level was so low: failed to promote chronic illnesses.

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