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The approximate time since the organism died can be worked out by measuring the amount of carbon-14 left in its remains compared to the amount in living organisms.
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, where r is a measurement of the rate of decay, k is the first order rate constant for the isotope, and N is the amount of radioisotope at the moment when the rate is measured.
The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. It is found in the air in carbon dioxide molecules.
The units of measure for time are dependent upon the unit of measure for the rate constant.
The ratio of "N/N Carbon-14 is a radioisotope formed in our atmosphere by the bombardment of nitrogen-14 by cosmic rays.
In this equation, the units of measure for N and No can be in grams, atoms, or moles.
It does not matter as long as they are like measures.
The amount of carbon-14 in the air has stayed the same for thousands of years.