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There are three main types of radiation or radioactive decay depending on the isotope. When isotopes are unstable they emit energy in the form of radiation.The important element is called The carbon-14 level of the object is then measured by scientists.

Scientists can measure the level of something which used to be alive and work out when it died.

Carbon is one of the most important elements to life on planet Earth.

The curie was named after Marie and Pierre Curie who discovered the element radium. The half-life of an isotope is the time on average that it takes for half of the atoms in a sample to decay.

For example, the half-life of carbon-14 is 5730 years.

Stable and Unstable Isotopes Elements can be made up of different isotopes. Different Types of Radioactivity How is it measured?

Isotopes are atoms with the same number of protons and electrons, but a different number of neutrons. These are the elements that we see around us and find in nature. Radioactivity is measured using a unit called the "curie". The curie measures how many atoms spontaneously decay each second.Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. It is found in the air in carbon dioxide molecules.Materials that originally came from living things, such as wood and natural fibres, can be dated by measuring the amount of carbon-14 they contain.For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.For example, the famous sarcophagus (see pic) of the child Pharaoh Tutankhamen at the British Museum was discovered in November 1922 yet it is still studied by historians right up to today and new things are learned about Tutankhamen himself and Egyptian life as a result.

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