But cesium-134, which has a half-life of only two years, clearly came from the meltdowns, the researchers say.
Those hot stocks turned out to have a half-life not much longer than iodine-131's.
This isotope, with a half-life of 2.6 million years, is not made in significant quantities by any process on Earth, but is expelled by supernovae.
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Iodine-131, with a half-life of only 8 days, decayed away in a few months following the accident and no one was found to have ingested any significant amount.
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From a molecular perspective, Lucentis was designed to stay in the eye and have a short half-life (two hours), while Avastin was designed to enter the circulatory system and to stick around to fight off cancer (a half-life of 20 days).
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Some of the most provocative Super Bowl advertising this year was for movies that you can't even buy yet, you will have forgotten by the time you can (if not already), will have a half-life of only weeks or months and will not be commercial successes.
Cesium-137 has a radioactive half-life of about 30 years, and traces of the isotope still persist from above-ground nuclear bomb tests in the 1950s and '60s.
Like most other psychiatrists, I dislike Xanax for this reason and will often try to switch long-term Xanax users to one of the other benzodiazepines that has a longer half-life and less liability for producing patterns of rising and falling anxiety across the day.
Dioxin, which is fat soluble, has a "half-life" of seven years in the body: It takes that long to break down half the quantity of the compound.
In the luckier half of the continent, history has a much shorter half-life.
Role-playing-games, and particularly action-RPGs, are my genre of choice, but a game like Half-Life 2, Team Fortress 2, or Bioshock are loads of fun.
It has a very short half-life, which in practical terms means that it goes in and out of the body very quickly.
Even a game like Half-Life 2, which was probably my first big PC shooter crush, felt pretty repetitive when it came to the badguys.
But what of those people who have outlasted their quota of threescore years and ten only to be kept in a state of half-life by the skills of medicine?
Most importantly, this ship will only have a "half-ship life, " because it has no growth potential to meet future threats and will have to be replaced in 15 years, which the Navy cannot afford to do.
Withdrawal-type symptoms typically resolve in a week or two depending on the half-life of the specific benzodiazepine involved, which suggests that at a gross level, the brain returns to normal fairly quickly.
It has a 30-year half life, and has been associated with higher muscle cancer risk.
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Few games carve out a space the way Half-Life 2 or BioShock did, or inspire me to actually finish playing the way the first Halo inspired.
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In short, they will have a threat-driven operational service life half that of a normal combatant ship.
Multiple other positive narratives are needed as only a full chorus of future-looking public commitments can supersede a story that may unfortunately have such an idiosyncratically extended half-life.
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Even Half-Life would feel funny as a film, with the first-person perspective ripped away and, one suspects, a chatty Gordon Freeman.
The half-life of a specialty is short, continually disintegrating into subspecialties, and sub-subspecialties, to the point where some doctors devote their whole career to one variant of one illness.
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There are plot twists and genuinely dramatic moments that made me think back to Half-Life 2 for a comparable experience.
He spent the first half of his life as a near-invalid, ill and frail and certain he was doomed to an early death, just like Shelley.
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Palaeogeneticists at the University of Copenhagen and Michael Bunce at Murdoch University in Perth, Australia determined the half-life after studying a set of 158 DNA-containing bones from an extinct species of bird called "moa" (a feat in and of itself).
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Quins fly-half Adrian Jarvis hit the crossbar from 30 metres soon after and the home side injected a bit of life into the game when England scrum-half Shaun Perry made a 25m jinking run.
With the rain lashing down and a swirling wind making life difficult on a bumpy pitch, there were few first-half thrills for the 3, 640 hardy souls in attendance.
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