radioactive dating. amount of parent isotope present amount of daughter isotope present decay
DESCRIPTION
Amount of Parent Isotope Present Amount of Daughter Isotope Present Will DECREASETRANSCRIPT
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Radioactive Dating
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Amount of ParentIsotope Present
Amount of Daughter
Isotope PresentDecay
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DecayAmount of
ParentIsotope Present
Amount of Daughter
Isotope Present
Will DECREAS
E
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DecayAmount of
ParentIsotope Present
Amount of Daughter
Isotope Present
Will DECREAS
E
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DecayAmount of
ParentIsotope Present
Amount of Daughter
Isotope Present
Will DECREAS
E
Will INCREAS
E
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DecayAmount of
ParentIsotope Present
Amount of Daughter
Isotope Present
Will DECREAS
E
Will INCREAS
E
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Ratio of: will INCREASEINCREASE
Daughter IsotopeParent Isotope
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Ratio of: will INCREASEINCREASE
Daughter IsotopeParent Isotope
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Good to 50 000 years
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Good to 5 billion years
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Earth’s atmosphere contains the element carbon, mainly in the form of carbon dioxide (CO2).Most of the carbon in the atmosphere consists of the stable isotope carbon–12 , but a very small fraction is a radioactive isotope called carbon–14 .The ratio of in the atmosphere has been relatively constant for the last 50 000 years.
126C
14 126 6C / C
146C
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Earth’s atmosphere contains the element carbon, mainly in the form of carbon dioxide (CO2).Most of the carbon in the atmosphere consists of the stable isotope carbon–12 , but a very small fraction is a radioactive isotope called carbon–14 .The ratio of in the atmosphere has been relatively constant for the last 50 000 years.
126C
14 126 6C / C
146C
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Earth’s atmosphere contains the element carbon, mainly in the form of carbon dioxide (CO2).Most of the carbon in the atmosphere consists of the stable isotope carbon–12 , but a very small fraction is a radioactive isotope called carbon–14 .The ratio of in the atmosphere has been relatively constant for the last 50 000 years.
126C
14 126 6C / C
146C
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Earth’s atmosphere contains the element carbon, mainly in the form of carbon dioxide (CO2).Most of the carbon in the atmosphere consists of the stable isotope carbon–12 , but a very small fraction is a radioactive isotope called carbon–14 .The ratio of in the atmosphere has been relatively constant for the last 50 000 years.
126C
14 126 6C / C
146C
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Carbon from the
Environment
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While they are still alive, the ratio of remains the same as it is in the environment.
14 126 6C / C
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When an organism dies, it stops getting fresh carbon from the environment.
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Remainsas it is
126C
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Remainsas it is
126C
Decreases as it decays
146C
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As the object gets older, the ratio of gradually decreases over time.
14 126 6C / C
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As the object gets older, the ratio of gradually decreases over time.
14 126 6C / C
Carbon–14 nuclei undergo beta decay:144 07 1
16 N eC
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144 07 1
16 N eC
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144 07 1
16 N eC
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144 07 1
16 N eC
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144 07 1
16 N eC
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144 07 1
16 N eC
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5730 y
144 07 1
16 N eC
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5730 y
50% of its original
carbon–14 will
still be present
144 07 1
16 N eC
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5730
y
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A rib-bone from an archeological site was analyzed. By measuring the ratio of in the sample and comparing it to that in the environment, archeologists calculated that 12.0% of its original remained. How old is the bone?
14 126 6C / C
146C
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12.0%12.0
%
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12.0%
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17 500 y
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17 500 y
17 500 years old