Uses of Radioactivity

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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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