PokeChem
Harmless
Posts: 12
Registered: 12-10-2015
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Mood: No Mood
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Half-Life can be much longer than it really is???
Look article on wikipedia: Isotopes of Astatine (another table showing only alfa radiations, below somewhere)
it seems that the longest half-life is few hours, but then for that same isotope with longest half life it says that it has half-life of more than 100
days if we look only alfa radiation, which is a small percentage of overall radiation. I always thought that Astatine can't exist for longer than a
day!!!
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careysub
International Hazard
Posts: 1339
Registered: 4-8-2014
Location: Coastal Sage Scrub Biome
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Mood: Lowest quantum state
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Many nuclides have more than one mode of decay, each with a different decay rate (which can be expressed as a half-life, though the "decay constant"
is a more useful form).
Rare decay modes have very low decay rates (and thus long half-lifes), but the actual decay rate of a nuclide is the sum of all modes, and thus its
actual half-life is shorter than any single mode (that is, shorter even than the shortest separate mode).
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aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
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Done any actual Chemistry recently PHD ?
I've not done much recently, and the past 4 experiments all failed dismally.
You do have to keep on trying though.
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