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S117Lecture22011

S117Lecture22011 - Radioactivity 1896 Henri Becquerel...

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Radioactivity 1896 Henri Becquerel discovers that a Uranium ore emitted “rays” that exposed a photographic plate (in the absence of sunlight). The original ore after emission of the rays has a component that has a different chemical properties (is a different element). The emitted rays can also be characterized by how they behave in electric and magnetic fields. Recall that charged particles are deflected by electric and magnetic fields. These emissions are determined to be charged particles! Alpha ( ) particles : Charge = +2 determined to be the same as He nuclei. Beta ( ) rays : Charge = +1 and -1 Those with -1 charge determined to be the same as the electron. Those with +1 charge are called positrons . Gamma ( ) rays : neutral and have no mass Radioactivity is a spontaneous, naturally occurring process!
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