Define radioactive dating

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Dinosaur bones do not have carbon-14 unless contaminated , as the dinosaurs became extinct over 60 million years ago. Carbon-14 has a half life of 5730 years and its daughter isotope is Nitrogen-14. This is not a guarantee for one specific sample.

A continuous record of growth rings has been used to calibrate radiocarbon ages back as far as 10,000 years ago. A stronger magnetic field shields the upper atmosphere better from charged cosmic rays, resulting in less carbon-14 production now than in the past.

Nuclear Chemistry: Half-Lives and Radioactive Dating - Radioactive decay is a natural process and comes from the atomic nucleus becoming unstable and releasing bits and pieces. If you have ever taken a tour of a cave and seen water dripping from stalactites on the ceiling to stalagmites on the floor of the cave, you have seen carbonate deposits being formed.