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Radiation is all around you. Your lifetime’s dose of radiation. What is responsible for each of the segments? Everyone is ...
Lesson 2a Radioactive Cornflakes
Learning Outcomes  <ul><li>You will be successful if you can: </li></ul><ul><li>Describe  sources of background radiation ...
What does radiation do  to you?
500 000  cosmic rays  pass through you  each hour.
From the  air : 30   000 radon atoms decay each hour in your lungs.
From our  food : 15 million atoms of potassium-40 decay inside you each hour.
From  rocks  and  building materials :  200 million gamma rays pass through you each hour.
Most people live their lives without being harmed by this  background radiation .
Radioactive materials emit ionizing radiation, which can damage living cells. nucleus cloud of electrons
Radiation can damage DNA. But that damage rarely leads to cancer, because DNA can repair itself.  Radiation-damaged DNA in...
This shows the average radiation exposure for a person in the UK. Radiation exposure depends on where you live and what yo...
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L2a

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L2a

  1. 1. Radiation is all around you. Your lifetime’s dose of radiation. What is responsible for each of the segments? Everyone is exposed to radiation from radioactive materials. What sources do you think contribute most to your radiation dose?
  2. 2. Lesson 2a Radioactive Cornflakes
  3. 3. Learning Outcomes <ul><li>You will be successful if you can: </li></ul><ul><li>Describe sources of background radiation and the potential risks it can pose. </li></ul><ul><li>Describe the effect of radiation on human (or other) tissues. </li></ul><ul><li>Explain the difference between irradiation and contamination. </li></ul><ul><li>Analyse newspaper reports to identify facts and opinions. </li></ul>
  4. 4. What does radiation do to you?
  5. 5. 500 000 cosmic rays pass through you each hour.
  6. 6. From the air : 30 000 radon atoms decay each hour in your lungs.
  7. 7. From our food : 15 million atoms of potassium-40 decay inside you each hour.
  8. 8. From rocks and building materials : 200 million gamma rays pass through you each hour.
  9. 9. Most people live their lives without being harmed by this background radiation .
  10. 10. Radioactive materials emit ionizing radiation, which can damage living cells. nucleus cloud of electrons
  11. 11. Radiation can damage DNA. But that damage rarely leads to cancer, because DNA can repair itself. Radiation-damaged DNA in a sperm or ovum can produce genetic defects.
  12. 12. This shows the average radiation exposure for a person in the UK. Radiation exposure depends on where you live and what you do.

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