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Polonium-210 has a half-life of 138 days.
  the time required for something to fall to half its initial value — especially radioactivity or (within the body) medication
 Mark word for later review on this computer
half-life half life
The half-life of highly radioactive substances is shorter than that of substances that radiate weakly.
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  • Polonium-210 has a half-life of 138 days.
  • Plutonium-239 has a half-life of 24,000 years.
  • The doubts arising from his initial failure had a longer half-life than he anticipated.
  • All these centuries, they have clung to half-life, hiding, waiting to reclaim their power.
    Rick Riordan  --  The Trials of Apollo

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  • Plutonium-239 has a half-life of twenty-four thousand years.
    David Baldacci  --  Zero Day
  • You have slain something pure and defenseless to save yourself, and you will have but a half-life, a cursed life, from the moment the blood touches your lips.
    J.K. Rowling  --  Harry Potter and the Sorcerer’s Stone
  • I preferred to set off and perish in search of my own kind than to live a lonely half-life of physical comfort and spiritual death on this murderous island.
    Yann Martel  --  Life of Pi
  • The radioactive element used in the core was solinium 2, which had a half-life of fourteen seconds.
    Eoin Colfer  --  Artemis Fowl
  • That was partially true as far as it went — but, if we had not faced all the problems before they arose, we were well aware of those that were constantly with us, and of those the main one was the need of dissembling, of leading all the time a suffocating half-life with our families.
    John Wyndham  --  The Chrysalids
  • It’s half-life is more than five thousand years.
    Pat Frank  --  Alas, Babylon

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  • For six years, Sobukwe lived a kind of half-life on the island; he was a free man who was denied his liberty.
    Nelson Mandela  --  Long Walk to Freedom
  • Something may have happened to the half-life that we don’t know about.
    Nevil Shute  --  On the Beach
  • All up the coast I could see the signs of what the Combine had accomplished since I was last through this country, things like, for example-a train stopping at a station and laying a string of full-grown men in mirrored suits and machined hats, laying them like a hatch of identical insects, half-life things coming pht-pht-pht out of the last car, then hooting its electric whistle and moving on down the spoiled land to deposit another hatch.
    Ken Kesey  --  One Flew Over the Cuckoo’s Nest
  • Those TV’s had a half-life of maybe two months.
    John Gardner  --  The Sunlight Dialogues
  • I watched men in moon suits bury drums of nuclear waste and I thought of the living rocks down there, the subterrane process, the half-life, the atoms that decay to half the original number.
    Don DeLillo  --  Underworld
  • More than five years, I should think—that’s the half-life.
    Nevil Shute  --  On the Beach
  • No good leaving it for the next corner, with the cobalt half-life over five years.
    Nevil Shute  --  On the Beach
  • She had known for some time that his wife and family were very real to him, more real by far than the half-life in a far corner of the world that had been forced upon him since the war.
    Nevil Shute  --  On the Beach
  • "The guy said plutonium has a half-life of twenty-four thousand years," said Cole.
    David Baldacci  --  Zero Day
  • Presently, as time passed, the radioactivity would pass also; with a cobalt half-life of about five years these streets and houses would be habitable again in twenty years at the latest, and probably sooner than that.
    Nevil Shute  --  On the Beach
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Associated words [difficulty]:   half-life [6] , laser [1] , entropy [4] , Mach [5] , speed of light [5] , thermodynamics [6] , viscosity [6] , convection [7] , electron microscope [7] , induction [7] , conduction [8] , specific heat [8] , surface tension [8] , Boyle’s law [9] , absolute zero [9]
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Most commonly used in these subjects:   Nature & Ecology, Science, Engineering
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