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The sample must be destroyed in order to measure its c14 content.The first measurements of radiocarbon were made in screen-walled Geiger counters with the sample prepared for measurement in a solid form.This discovery meant that there are three naturally occurring isotopes of carbon: Whereas carbon-12 and carbon-13 are stable isotopes, carbon-14 is unstable or radioactive.Carbon-14 is produced in the upper atmosphere when cosmic rays bombard nitrogen atoms.Libby calculated the half-life of c14 as 5568 ± 30 years.

The objective of pre-treatment is to ensure that the carbon being analyzed is native to the sample submitted for dating.

Since carbon is fundamental to life, occurring along with hydrogen in all organic compounds, the detection of such an isotope might form the basis for a method to establish the age of ancient materials.

Libby, a Professor of Chemistry at the University of Chicago, predicted that a radioactive isotope of carbon, known as carbon-14, would be found to occur in nature.

the field deflects atoms of different masses differently (heavier atoms deflect less).

Targets tuned to different atomic weights count the number of c12, c13, and c 14 atoms in a sample.

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