exam 4 (radioactive material)

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Last updated 7:44 PM on 4/23/26
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6 Terms

1
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other applications of radio active material

radioactive tracers

radiation therapy

food sterilization

smoke detectors

radiometric dating

2
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what are radio active tracers

  • PET scans

  • positron (anti matter) is emitted

  • gamma rays are detected to produce image

  • f-18 is used

3
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what is radiation therapy

  • gamma reys to damage DNA in cancer cells

  • Co-60 is used

  • same technique used to sterilize food

  • cancer cells cant replicate after radiation

4
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what are smoke detectors

  • smoke particles shut off circuit triggering alarm

  • relies on alpha decay

  • ionized air moves current supplied by battery

  • Am-121 is used

5
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what is carbon dating

  • undergoes beta decay to produce N-14

  • C-14 is used

  • used to determine the age of dead organisms

  • relies on half life of 5700 years

6
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what is U-Pb and Pb-Pb dating

  • U-238 and U-235 decay into Pb-206 and Pb-207

  • zero lead present at the start because it cannot be inluced in crystal structure

  • used to determine the age of earth

  • requires analysis of zircon crystals