Uses of Radioactivity

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  • Created by: katie
  • Created on: 08-05-13 21:11
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  • uses of radioactivity
    • Medicine
      • Iodine 131 for patients with defective thyroid glands
    • Radio - dating
      • Carbon 14 -  calculate the age of plant and animal remains
      • Potassium 40 - estimate the geological age of rocks.
  • Cobalt 60: radiotherapy for treatment of cancer
    • Medicine
      • Iodine 131 for patients with defective thyroid glands
  • high energy gamma rays - kill cancer cells
    • Cobalt 60: radiotherapy for treatment of cancer
    • Carbon 14 -  calculate the age of plant and animal remains
    • Potassium 40 - estimate the geological age of rocks.
    • Analysis
      • uses of radioactivity
        • Radio - dating
      • Dilution analysis.
        • Analysis
          • isotopically labelled substances find mass of substance in mixture.
        • Monitoring thickness of meta strips
          • metal in between two rollers - get right thickness
            • Monitoring thickness of meta strips
            • radioactive source and detector on opposite sides
              • metal in between two rollers - get right thickness
              • Amount of radiation increases - detector moves the rollers apart
                • radioactive source and detector on opposite sides
                • Living cells absorb carbon-14  - when dead  no absorption
                  • carbon 14 decays - rate of decay decreases over the years
                    • Living cells absorb carbon-14  - when dead  no absorption
                    • acts as tracer - study uptake of iodine in gland
                      • potassium into argon 40 by nucleus gaining inner electron
                        • Measuring the ratio of potassium 40:rgon-40 in a rock gives estimate of age

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