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Unit 14: Nuclear CHemistry. Section 3: Radioactive Decay and Half-Life. Radioactive Decay. The spontaneous emission of rays or particles from certain nuclei as they “decay,” such as Uranium . These rays or particles are called nuclear radiation . They come in three types:

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unit 14 nuclear chemistry

Unit 14: Nuclear CHemistry

Section 3: Radioactive Decay and

Half-Life

radioactive decay
Radioactive Decay
  • The spontaneous emission of rays or particles from certain nuclei as they “decay,” such as Uranium.
    • These rays or particles are called nuclear radiation.
    • They come in three types:
      • Alpha Radiation: Helium nucleus; 2+ Charge; Low power (0.05 mm body tissue)
      • Beta Radiation: electron; 1- Charge; Moderate power (4 mm body tissue)
      • Gamma Radiation: electromagnetic wave; neutral charge; High Power (penetrates entire body easily)
half life
Half-Life
  • While the process is spontaneous, it is not instantaneous… it takes time!
  • The time required for HALF of the atoms of a radioactive substance to decay is called a half-life.
example fluorine 18
Example: Fluorine-18

18

9

  • Fluorine 18 ( F) has a half-life of 110 seconds. This material is used extensively in medicine. The hospital laboratory begins the day with 10 grams of F…

18

9

slide8
How many half-lives of f-18 occur in 11 minutes (660 sec)?

1 half-life = 110 seconds

660 seconds

110 seconds

= 6 half-lives

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How much of the 10-gram sample would be left after 11 minutes?
  • 6 half-lives = 10 divided in half, 6 times
  • 10/2 = 5 grams
  • 5/2 = 2.5 grams
  • 2.5/2 = 1.25 grams
  • 1.25/2 = 0.625 grams
  • 0.625/2 = 0.3125 grams
  • 0.3125/2 = 0.15625 grams

After 11 minutes, only 0.16 g of the 10 g sample remain!!!!!!

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