But cesium-134, which has a half-life of only two years, clearly came from the meltdowns, the researchers say.
The still-not-publisher of Half-Life 3 is of course no stranger to furious speculation about its intentions.
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Those hot stocks turned out to have a half-life not much longer than iodine-131's.
Once read they will self-destruct in your brain faster than the half-life of radioactive cobalt.
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Working in the computer industry, my work is focused on technology that has the half-life of sushi.
If they launch the system alongside Half-Life 3 and some other first-party gems, this could make huge waves.
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Like other Valve titles recently released to Steam for Linux, Half-Life 2 is merely a beta for now.
Will Dr. Horrible become the next always-promised, never-delivered project that tantalizes fans for years, like the videogame Half-Life 3?
One of the first things that Physics students learn when they study radioactivity is the idea of the half-life.
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In the luckier half of the continent, history has a much shorter half-life.
There are plot twists and genuinely dramatic moments that made me think back to Half-Life 2 for a comparable experience.
Portal is a game from 2007, its cutting edge somewhat dulled technologically, and the original Half-Life was first published in 1998.
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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.
Though I doubt Half-Life 3 will be a Steam Box exclusive, it could still release as part of a package deal.
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That will depend on the particular isotopes produced and their half-life ages.
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Careers are more volatile, too, as the half-life of marketable knowledge shrinks.
It has a very short half-life, which in practical terms means that it goes in and out of the body very quickly.
"Cyanide has a short half-life, and it may be lost over the postmortem interval unless the tissues are adequately preserved, " Cina said Friday.
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And just to underline how cool it is, Valve green lit Black Mesa, a remake of one of its own games (Half-Life).
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.
Because of this, it seems to me that in the past decade or so, the half-life of our memories has become artificially extended.
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References to the year "1880" dropped by half in the 32 years after that date, while the half-life of "1973" was a mere decade.
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.
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.
You already know that Half-Life 2 for Xbox, Xbox 360, PlayStation 3, PC and OS X is excellent, but have you tried it on Linux?
The first time I played Halo felt a little bit like the first time I played DOOM or the first time I played Half-Life 2.
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Half-Life 2 revisits Gordon Freeman and gives him an alien occupation to fight off and a gravity gun to help him with the dirty work.
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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The 1998 tests have since given nuclear weapons an extended half-life.
Oh, and if you want an update on Half-Life 3, Newell re-confirms that " Ricochet 2" is being worked on, so take that as you will.
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