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Radiation post Winter 2009

Radiation post Winter 2009 - Radiation Radioactivity X...

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X Radiation : Any Process That Results in the Emission of Radiant Energy. X Radioactivity : Possessing The Capacity to Emit Radiation by The Disintegration of The Atomic Nucleus. Radioactive Atoms H 1 1 # of Protons ÷ # of Protons + # of Neutrons ÷ H 1 H 2 3 H Types of Radioactivity X β Particle : X α Particle : X γ Ray : Helium Atoms Electrons Photon (Energy) 3 Types : Half Life X Half Life : Amount of Time For a Radioactive Substance To Decay To “One Half” Of Its Previous Value. 1 2 DPM : Disintegrations Per Minute ! Marie Curie : ?? Who was she ? C 14 } Half Life = 5 73 0 Years ! Carbon Dating ? H 3 } Half Life = 12 Years K 40 } Half Life = 1.3 Billion Years ! All β Emitters Also γ Emitter. UV Radiation X Sunlight (Visible Spectrum) : Humans Can See 400nm ( Violet ) : 700nm ( Red ) -[ R o y . G . B i v .] X UV C : X UV B : X UV A : 320 - 400 nm Poor DNA Reaction. } - Least Harmful
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Radiation post Winter 2009 - Radiation Radioactivity X...

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