View Full Version : carbon - 14 dating


emmas
05-15-09, 06:14 PM
I'm tearing my hair out with what i thought was a simple question and wondered if anyone can help out.
i have to estimate the age of a water sample
i have 0.416 mg carbon-14 atoms in total (from dissolved CO2 HCO-3 & CO-3)
and 1.246mg of daughter nitrogen-14 atoms (N2 molecules)
I have trawled through my book and i just can't get to grips with this can someone please give me a helping hand,
i'm desperate,
many many thanks to someone who can
em.

zoe
05-25-09, 11:26 AM
I'm tearing my hair out with what i thought was a simple question and wondered if anyone can help out.
i have to estimate the age of a water sample
i have 0.416 mg carbon-14 atoms in total (from dissolved CO2 HCO-3 & CO-3)
and 1.246mg of daughter nitrogen-14 atoms (N2 molecules)
I have trawled through my book and i just can't get to grips with this can someone please give me a helping hand,
i'm desperate,
many many thanks to someone who can
em.

I'm tearing my hair out with the same question did you have any luck sorting it? I think we need to work out how many atoms are in the 0.416 mg and 1.246 mg before we can do anything but i don't know how to do this.
If you can help please let me know.:shrug:

Nasor
05-25-09, 11:41 AM
You have three times as much N14 as C14, so if you assume that all the N14 came from C14, it means the C14 has gone through 2 half-lives. If not all the N14 came from C14, then I don't think the problem can be worked out with the information given.