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Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.

To determine the ages of these specimens, scientists need an isotope with a very long half-life.

But this sediment doesn't typically include the necessary isotopes in measurable amounts.

Fossils can't form in the igneous rock that usually does contain the isotopes.

His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.

Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

These cancers include: Breast cancer is the most common cancer diagnosed during pregnancy.

It affects about 1 in 3,000 women who are pregnant.

The most widely known form of radiometric dating is carbon-14 dating.

This is what archaeologists use to determine the age of human-made artifacts. The half-life of carbon-14 is only 5,730 years, so carbon-14 dating is only effective on samples that are less than 50,000 years old.

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