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Lecture 6

Study Guide for Lecture 6: information from lecture slides + information added by prof during lecture

4 Pages
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Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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EESA10 – Human Health and the Environment
LECTURE 6
Slide: Radiation and Human Health
-We cannot escape radiation exposure; it is all around us,
different types of radiation have different affects on us.
-Natural radiation (sunlight, cosmic rays from outer
space) cannot be controlled, manmade radiation (x-ray
machines, microwaves, lasers, radar devices) can be
controlled
Slide: Radiation and Human health
-Ionized radiation is radiation that has so much energy
that it can change atoms (by pushing electrons out of the
atom) and form (strong) ions; dangerous form of
radiation, is able to break chemical bonds that are
important to the human body
-Non-ionized radiation is low energy radiation that cannot
do much to an atom (does not exhibit enough energy to
change atoms)
Slide: Health effects from exposure to radionuclides
-Stochastic health effects: result from long term, low
levels of exposure, increased levels of exposure make
these effects more likely to occur but the type or severity
of the effect do not change
oCancer: uncontrolled cell growth
oDNA changes: teratogenic effects (birth defects);
mothers exposure to radiation (most sensitive in
weeks 8-15 of pregnancy) will cause the fetus to
have health problems (genetic mutations)
-Non-stochastic health effects: result from short term,
high levels of exposure, increased levels of exposure
make the effects more severe
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Description
EESA10 Human Health and the Environment LECTURE 6 Slide: Radiation and Human Health - We cannot escape radiation exposure; it is all around us, different types of radiation have different affects on us. - Natural radiation (sunlight, cosmic rays from outer space) cannot be controlled, manmade radiation (x-ray machines, microwaves, lasers, radar devices) can be controlled Slide: Radiation and Human health - Ionized radiation is radiation that has so much energy that it can change atoms (by pushing electrons out of the atom) and form (strong) ions; dangerous form of radiation, is able to break chemical bonds that are important to the human body - Non-ionized radiation is low energy radiation that cannot do much to an atom (does not exhibit enough energy to change atoms) Slide: Health effects from exposure to radionuclides - Stochastic health effects: result from long term, low levels of exposure, increased levels of exposure make these effects more likely to occur but the type or severity of the effect do not change o Cancer: uncontrolled cell growth o DNA changes: teratogenic effects (birth defects); mothers exposure to radiation (most sensitive in weeks 8-15 of pregnancy) will cause the fetus to have health problems (genetic mutations) - Non-stochastic health effects: result from short term, high levels of exposure, increased levels of exposure make the effects more severe www.notesolution.com
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