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March 05, 2026, 12:17:11 pm
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Author Topic: potassium 40~~~!!  (Read 2040 times)  Share 

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sillysmile

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potassium 40~~~!!
« on: October 29, 2010, 12:09:00 pm »
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what is the half-life of potassium 40?
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jasoN-

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Re: potassium 40~~~!!
« Reply #1 on: October 29, 2010, 12:10:25 pm »
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1.3 billion years according to that Douchy guy (only found out about this guy yesterday, got a lot of listening to do :/)
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sillysmile

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Re: potassium 40~~~!!
« Reply #2 on: October 29, 2010, 12:11:24 pm »
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Quote from: jasoN- on October 29, 2010, 12:10:25 pm
1.3 billion years according to that Douchy guy (only found out about this guy yesterday, got a lot of listening to do :/)
oh bad luck there jason :(
thank you for the info.
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masonnnn

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Re: potassium 40~~~!!
« Reply #3 on: October 29, 2010, 12:11:50 pm »
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long enough that you can say it for anything that is too old for carbon dating i'm pretty sure.
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herzy

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Re: potassium 40~~~!!
« Reply #4 on: October 29, 2010, 12:16:16 pm »
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be careful though, if the halflife is too big, it probs wont be useful... uranium is generally a good one to use for relatively recent evolution stuff
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sillysmile

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Re: potassium 40~~~!!
« Reply #5 on: October 29, 2010, 12:29:06 pm »
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Quote from: herzy on October 29, 2010, 12:16:16 pm
be careful though, if the halflife is too big, it probs wont be useful... uranium is generally a good one to use for relatively recent evolution stuff
uranium 235?
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slothpomba

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Re: potassium 40~~~!!
« Reply #6 on: October 29, 2010, 12:34:28 pm »
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Rubidium and Strontium is your go to guy for old stuff i'd say and anything under 50 000 years carbon.... not sure if youll see much on the ones inbetween....

ESR is always an option as well but its not really radioisotropic per se...
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herzy

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Re: potassium 40~~~!!
« Reply #7 on: October 29, 2010, 12:57:02 pm »
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carbon obviously for anything carbon-based under 50 000 years, then yes Uranium 235. Rb etc are way too old to be relevant for anything except extremely deep phylogenetic inferences... and hence unlikely to be useful for a vce bio exam
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jasoN-

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Re: potassium 40~~~!!
« Reply #8 on: October 29, 2010, 01:00:28 pm »
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what does uranium 235 decay to?
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akira88

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Re: potassium 40~~~!!
« Reply #9 on: October 29, 2010, 01:10:51 pm »
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Quote from: jasoN- on October 29, 2010, 01:00:28 pm
what does uranium 235 decay to?
Off the top of my head, lead?
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simpak

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Re: potassium 40~~~!!
« Reply #10 on: October 29, 2010, 01:13:59 pm »
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jasoN-

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Re: potassium 40~~~!!
« Reply #11 on: October 29, 2010, 01:17:48 pm »
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wiki states both lead and thorium
http://en.wikipedia.org/wiki/Radiometric_dating#Uranium-lead_dating_method
im just gonna go with lead, sounds conventional
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simpak

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Re: potassium 40~~~!!
« Reply #12 on: October 29, 2010, 01:18:34 pm »
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Quote from: jasoN- on October 29, 2010, 01:17:48 pm
wiki states both lead and thorium
http://en.wikipedia.org/wiki/Radiometric_dating#Uranium-lead_dating_method
im just gonna go with lead, sounds conventional

Poor old Thorium.
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jasoN-

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Re: potassium 40~~~!!
« Reply #13 on: October 29, 2010, 01:30:32 pm »
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what do we need to know about mtDNA (don't want to make a new thread)
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