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Aren Berkenbush
ELECTROMAGNETIC SPECTRUM:GAMMA RAYS
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-Paul Villard is credited with the discovery of the gamma ray.
-The gamma ray was discovered in 1990 while studying radiation emitted from radium.
HISTORY OF THE GAMMA RAY
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FREQUENCY= 10 hertz or higher
WAVELENGTH= less than 10 meters
FREQUENCY & WAVELENGTH
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-The gamma ray is used medically and commercially to kill cancer cells with radiotherapy
-Sterilization of food
-Sterilization of medical equipment
HOW IS IT USED?
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Dictionary definition of Gamma Ray:
penetrating electromagnetic radiation of shorter wavelength
-They are the most energetic form of light
-Gamma rays have the shortest wavelengths and greatest energy
How do they work?
Gamma rays can be produced either as a result of a nuclear reaction or by the annihilation(destruction) of matter
WHAT ARE THEY?/HOW DO THEY WORK?
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-A high energy particle can collide with another particle
-A charged particle can be accelerated
-An element can undergo radioactive decay
-A particle can collide and annihilate with its anti-particle
radioactive decay
HOW IS IT PRODUCED?
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-Can be harmful to existing cells by causing cell damage
-Can cause cell mutations
-A living thing exposed to intense or prolonged gamma radiation can become seriously ill and die.
HEALTH RISKS/HAZARDS
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-Wavelength- The distance between successive crests of a wave.
typical units: meters
-Frequency- The rate at which something occurs or is repeated over a particular period of time.
typical units: hertz
-Wavelength and Frequency are inversely related.
-Speed= Wavelength x Frequency
-A wave period is the time that it takes one crest of a wave to pass by a fixed point until the next crest passes the same fixed point.
-Period= 1 / frequency
WAVELENGTH/FREQUENCY INFO
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-Amplitude: the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
AMPLITUDE
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http://www.youtube.com/watch?v=okyynBaSOtA
VIDEO