# Carbon dating qWatch

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#1
I know that after death the amount of carbon-14 in an animal or plant decreases and we can get the age by comparing the amount left with the initial value of C 14 but please can someone how we get the initial value in the first place? Esp for dinosaurs and other extinct species?
Is there an equation for that?
0
6 days ago
#2
(Original post by Presto)
I know that after death the amount of carbon-14 in an animal or plant decreases and we can get the age by comparing the amount left with the initial value of C 14 but please can someone how we get the initial value in the first place? Esp for dinosaurs and other extinct species?
Is there an equation for that?
Carbon dating works uptp about 50000 year so it's not really suitable for aging dinosaurs.
C14 is being continually produced in the upper atmosphere and we basically assume it's had a constant abundance over the last few tens of thousand of years.
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#3
(Original post by Joinedup)
Carbon dating works uptp about 50000 year so it's not really suitable for aging dinosaurs.
C14 is being continually produced in the upper atmosphere and we basically assume it's had a constant abundance over the last few tens of thousand of years.
Ok thanks
I don't get the second part
Can you please elaborate on how that helps us get the initial value?
Last edited by Presto; 6 days ago
0
5 days ago
#4
(Original post by Presto)
Ok thanks
I don't get the second part
Can you please elaborate on how that helps us get the initial value?
measure the current abundance of C14
assume it's been the same over the last 50000 years
(C14 is caused by cosmic rays interacting with the upper atmosphere and it's pretty reasonable to assume that cosmic rays have been arriving pretty constantly.)
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#5
Oh ok thanks!
(Original post by Joinedup)
measure the current abundance of C14
assume it's been the same over the last 50000 years
(C14 is caused by cosmic rays interacting with the upper atmosphere and it's pretty reasonable to assume that cosmic rays have been arriving pretty constantly.)
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4 days ago
#6
If you want a worked example of carbon dating question, have a look at the following link on example 10.6.
https://cnx.org/contents/[email protected]

(Original post by Presto)
I know that after death the amount of carbon-14 in an animal or plant decreases and we can get the age by comparing the amount left with the initial value of C 14 but please can someone how we get the initial value in the first place? Esp for dinosaurs and other extinct species?
Is there an equation for that?
0
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