background radiation

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6 Terms

1
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What are the natural sources of background radiation

  • radioactive rock (granite)

  • Cosmic rays from space

  • food- some foods naturally contain radioactive isotopes

  • Radon gas- a radioactive gas released by rocks

2
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What is background radiation

Low level radiation that is present at all times around us

3
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What are cosmic rays

Very hight energy particles which travel through space and crash into earths atmosphere

4
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What are manmade sources of background radiation

  • fall out from nuclear weapons testing- nuclear weapons testing has released radioactive isotopes into environment for decades

  • nuclear accidents - radioactive isotopes are released by accidents at nuclear power stations

5
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What does your exposure to background radiation affected by

location - underground rocks(granite) can release radioactive radon gas which may get trapped in houses (radon detector can check levels )

people at high altitudes are exposed to more background radiation in tugs from of cosmic rays than ppl living at sea level

occupation- nuclear workers and uranium miners exposed to 10x normal radiation

-radiographers in hospitals

6
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What is dose of radiation measured in

Sieverts