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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.

So we say that this imaginary substance has a half-life of 2 hours.

The count rate coming from a radioactive source depends on how many unstable atoms it contains. If the count rate has fallen by half, it means the number of unstable atoms has fallen by half.

We cannot predict exactly which atom will decay at a certain time but we can estimate, using the half-life, how many will decay over a period of time.

The half-life of a substance can be found by measuring the count-rate of the substance with a Geiger-Muller tube over a period of time.

For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.

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The count rate is measured by using an instrument called a Geiger-Muller tube over a period of time.This process occurs naturally and cannot be influenced by chemical or physical processes.The release of radiation is also a random event and overtime the activity of the radioactive material decreases.This is called the half life of radioactive material or radioisotope.Half life can be defined as the time taken for the number of nuclei in a radioactive material to halve.

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