Radiometric dating laboratory circuitspeeddating com
The best radioactive element to use to date human fossils is Carbon-14.
After you prepare your sample and put it into the machine, your readout says you have approximately 75% Nitrogen-14 and 25% Carbon-14.
As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope.
By measuring the ratio of the amount of the original radioactive element to the daughter isotope, scientists can determine how many half-lives the element has undergone and from there can figure out the absolute age of the sample.
Now it is time to put those math skills to good use.
At one half-life, you would have approximately 50% Carbon-14 and 50% Nitrogen-14.