Radiation

  • Dangers
  • Types of Radiation
  • Radioactive Decay
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  • Created by: JudiWood
  • Created on: 01-05-14 10:38
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  • Radiation
    • Types
      • Alpha
        • Not very dangerous outside the body as they can't penetrate through the skin
        • Most dangerous inside the body because it is easily absorbed by cells.
      • Beta
        • Very dangerous outside the body as they can penetrate skin and harm the living cells inside.
        • Not very dangerous inside the body as they are unlikely to be absorbed by living cells.
      • Gamma
        • Very dangerous if outside the body as they can penetrate skin and harm the living cells inside.
        • Not very dangerous inside the body as they are unlikely to be absorbed by the living cells
      • Positron
      • Neutron
    • All radiation has a charge, penetration and ionisation. These vary with the types of radiation.
    • Radioactive Decay
      • Atoms are made up of protons, neutrons and electrons.
        • Every atoms has an equal number of positive protons and negative electrons, so there is no overall charge.
      • Nuclei that are unstable split up in radioactive decay and emit radioactive radiation.
        • Five types of radioactive radiation
      • When there is too many or too few neutrons in the nucleus (compared to the proton number) the atom becomes unstable.
        • These are called radioactive isotopes.
    • Tumour Treatment
      • High-powered Gamma rays are arranged in several weaker sources aroud the body to focus on the cancer cells.
      • Radiation therapy can be given both externally and internally
      • Gamma rays are strong enough to kill cancer cells as well as the normal, uncancerous cells so the targeting has to be precise.
    • Dangers
      • When radiaton collides with living particles, severe damage can be done
        • If the nucleus DNA is damaged, the cell may become cancerous.
      • The greater the dose of radiation that the lliving cell receives, the higher the chance of severe damage.
      • Very high doses can kill cells completely - this can be used in medical treatment against cancer cells.

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