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Exponential Decay Formula: A = A" is the original amount of the radioactive isotope that is measured in the same units as "A." The value "t" is the time it takes to reduce the original amount of the isotope to the present amount, and "k" is the half-life of the isotope, measured in the same units as "t." The applet allows you to choose the C-14 to C-12 ratio, then calculates the age of our skull from the formula above.
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The word "estimates" is used because there is a significant amount of uncertainty in these measurements.
After 5600 years, if we start with a gram, we end up with half a gram.
This rather complex formula shows you how to solve this puzzle using accepted scientific methods.
Each sample type has specific problems associated with its use for dating purposes, including contamination and special environmental effects.
More information on the sources of error in carbon dating are presented at the bottom of this page.