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The best radioactive element to use to date human fossils is Carbon-14.There are several reasons why, but the main reasons is that Carbon-14 is a naturally occurring isotope in all forms of life and its half-life is about 5730 years, so we are able to use it to date more "recent" forms of life relative to the Geologic Time Scale.In other words, half (50%) of the Carbon-14 you started with has decayed into the daughter isotope Nitrogen-14.However, your readout from your radioactivity measuring instrument says you have only 25% Carbon-14 and 75% Nitrogen-14, so your fossil must have been through more than one half-life.So we exchanged numbers, solidified a date for the following Friday and began to text -- every single day.
Half of 50% is 25%, so you would have 25% Carbon-14 and 75% Nitrogen-14.
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.
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One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating.