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The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. Uranium has a very long half-life and so by measuring how much uranium is left in a rock its approximate age can be worked out.

The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly.

So, when looking at the history of a cliff face, it is important to read the story it tells from the bottom layer up.

Geologists often need to know the age of material that they find.

They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.

This is different to relative dating, which only puts geological events in time Most absolute dates for rocks are obtained with radiometric methods.

If you could watch a single atom of a radioactive isotope, U-238, for example, you wouldn’t be able to predict when that particular atom might decay.

Now this trip can be made fairly easy with the appearance of all the satellite navigation equipment like GPS and others, but during the Soviet Era they had none of this.

Knowing about half-lives is important because it enables you to determine when a sample of radioactive material is safe to handle.

Russian Northern coast is a vast territory lays for a few thousand of miles and all this coastline is inside the Polar Circle.

The carbon-14 it contained at the time of death decays over a long period of time.

By measuring the amount of carbon-14 left in dead organic material the approximate time since it died can be worked out.

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