half-life

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If you assume that Beijing has fourteen million people (and don't bother controlling for migrant labor, tourists, etc.) a one year half-life would leave Beijing with a population of just thirteen people in a mere twenty years.

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Definitions (5)

Toggle American Heritage definitions American Heritage Dictionary (3)

  1. noun Physics The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive decay.
  2. noun Biology The time required for half the quantity of a drug or other substance deposited in a living organism to be metabolized or eliminated by normal biological processes. Also called biological half-life.
  3. noun Biology The time required for the radioactivity of material taken in by a living organism to be reduced to half its initial value by a combination of biological elimination processes and radioactive decay.

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Examples (18)

  • If we all had the mortality rate of present-day Western 11-year-olds, our half-life would be about 1000 years. —  April's CR Diary
  • The programs that got the awards all have a very short "half-life" - you use them, and return to the OS quickly (to process your results further) … —  TamsPalm - the Palm OS / web OS Blog
  • Mark this official forewarning, Cedar County Highway Maintenance: half-life isotope calculations by Professor Chuck indicate your truck will be unsafe for usage until next Wednesday, and Iowahawk cannot be liable for mutations of your foolish crews! —  iowahawk
  • In terms of a strong male hard on, it also performs another vital function - increasing the half-life of the endothelium relaxation factor, important for a harder and longer erection. —  Find Free Articles - ArticlesBase
  • Because the atmosphere of crisis is now so thick at the White House, any moment of triumph has a fleeting half-life, but the impending passage of the seven-hundred-and-eighty-seven-billion-dollar stimulus bill provided, at least for an afternoon, a sense of satisfaction. —  The New Yorker
 

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