eChapter 5 - Chapter 5 The atomic nucleus Cathode Revisited...

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Chapter 5 The atomic nucleus
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Cathode Revisited In a high voltage cathode ray tube, more than an electron beam is produced A new beam that is not deflected by electric or magnetic fields was produced
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X-rays These rays were discovered by Roentgen They were named X because he did not know what they were
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These X-rays caused photographic paper to be exposed without having any light contact them This lead the way for the discovery of new radiation and elements
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Becquerel – studied uranium. At first it appeared to be like X-rays and phosphorescence But the uranium exposed the photographic paper without needing sunlight
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Marie Curie – also in the early 1900s she and her husband Pierre discovered two new radioactive elements, polonium and radium Radioactivity – describes a materials ability to emit radiation
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Alpha particles Composed of two protons and two neutrons they are the heaviest of the radioactive products Large positive charge will be bent towards a negatively charged plate Extremely poor ability to penetrate materials
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Beta Particles These are basically just an electron that has been ejected from the nucleus Just like other electrons beta particles are attracted to a positively charged plate Decent ability to penetrate materials
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Gamma Rays These rays are pure energy They can travel a very long distance and penetrate thick materials These are the most destructive types of rays
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Radiation Is All Around Us We are exposed to radiation every day Where does most of this radiation come from?
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The majority of cosmic radiation is absorbed in the atmosphere But what happens as we move from sea level to higher altitudes?
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Which of the following professions would you expect to have the highest exposure to radiation? 1) laboratory researcher 2) X-ray technician 3) commercial airline pilot 4) coal miner 5) nuclear power plant technician
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radioactive materials How is radiation measured? Sterilization
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This document was uploaded on 10/26/2011 for the course SPAN 1512 at South Plains College.

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eChapter 5 - Chapter 5 The atomic nucleus Cathode Revisited...

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