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Lecture 6

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University of Toronto Scarborough
Environmental Science
Jovan Stefanovic

EESA10 Lecture 6Radiation and Human HealthSlide 1Radiation and Human HealthRadiation is everywhere all around us We cannot escape radiation But the question is what type and how much radiation is there Even if we are walking outside in the woods we are still exposed to some radiation because of Background Radiation Something that is produced and emitted from outer space Natural radioactivity in the earth and by cosmic rays from outer space This type of radiation cannot be controlled We are always exposed to it It has existed for hundreds of thousands of years Something that we can control is man made radiation Electronic devices appliances etc Note Nowadays engineers have found technologies to protect us from most of this radiation Examples of some manmade devices that emit different types of radiation includeXray machines different kind of equipment used in labs for analysis for example CCA can also be detected using Xray Xray Diagnostic Xray used for diagnostic of different body parts Television sets Microwave ovensLasersSlide 2Ionizing radiation exposure to the publicNatural radiation sources consists of 82 of total measurable radiation Manmade radiation is just 18 Medical xrays nuclear medicine can treat some illnesses and some other types of radiation What is surprising is that Radon gas in indoor air makes up 55 of total radiation Slide 3Radiation and Human HealthWe have two big groups of radiation 1 Ionized Radiation Cosmic Gamma Xrays This is radiation that has so much energy that can change atoms on some other chemicals They can push electrons out of their atoms and produce ionized form of that element They are very strong as they have so much energy Note On electric spectrum elements that are very high in energy have short wavelength elements with low energy nonionized have long wavelength 2 NonIonized Radiation Radio waves TV waves Microwaves This type does not have enough energy low in energy and they cannot remove electrons from atomsSlide 4Ionized Radiation
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