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Different isotopes of the same element have the same number of protons in their atomic nuclei but differing numbers of neutrons.

They can also be defined as atoms that contain an unstable combination of neutrons and protons.

The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.

Libby received the Nobel Prize in Chemistry for his work in 1960.

Radioisotopes are widely used in medicine, industry and scientific research, and new applications for their use are constantly being developed.

Radioisotopes are radioactive isotopes of an element.

The radiocarbon dating method is based on the fact that radiocarbon is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen.

A substantial hurdle is the difficulty of working out fossil ages.

The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.

The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.

The radioactive decay process of each type of radioisotope is unique and is measured with a time period called a half-life.

Radioisotopes are an essential part of radiopharmaceuticals.

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