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Issue:

Technology

 

Written by:

Patricia M

 

Date added:

October 15, 2011

 

Level:

University

 

Grade:

A

 

No of pages / words:

1 / 273

 

Was viewed:

8110 times

 

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Essay content:

Raw, i.e. uncalibrated, radiocarbon ages are usually reported in radiocarbon years "Before Present" (BP), "Present" being defined as AD 1950. Such raw ages can be calibrated to give calendar dates. One of the most frequent uses of radiocarbon dating is to estimate the age of organic remains from archaeological sites...
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When plants fix atmospheric carbon dioxide (CO2) into organic material during photosynthesis they incorporate a quantity of 14C that approximately matches the level of this isotope in the atmosphere (a small difference occurs because of isotope fractionation, but this is corrected after laboratory analysis)...
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