physics unit 5

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Author:
ghoran
ID:
297100
Filename:
physics unit 5
Updated:
2015-02-28 10:19:58
Tags:
radioactivity
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Description:
revision
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  1. alpha nature
    two protons and two neutrons 
  2. beta nature
    an electron 
  3. gamma nature
    • high frequency electromagnetic radiation 
  4. alpha penetrating power
    easily stopped e.g. by a sheet of paper or the outer layer of dead skin cells
  5. beta penetrating power
    stopped by thin (a few mm) metal sheet
  6. gamma penetrating power
    reduced intensity by 1/2 by about 5cm of concrete or 1cm of lead
  7. .... fields can also be used to determine whether a sample of radioactive sample is emitting alpha , beta or gamma
    magnetic
  8. the major sources of background radiation are
    • air 
    • rocks and buildings 
    • cosmic rays 
    • food and drink 
    • medical 
    • miscellaneous
  9. air
    this dose is mainly from radon and thorn , radioactive gases that are part of long lived decay series
  10. rocks and buildings
    some rocks particularly granite contain uranium-238 or thorium-232 . these two isotopes have long half lives and decay to other radioactive products . the radiation dose from this depends on where you live .

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