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The count rate is measured by using an instrument called a Geiger-Muller tube over a period of time.

A Geiger-Muller tube detects radiations by absorbing the radiation and converting it into an electrical pulse which triggers a counter and is displayed as a count rate. ] Radioactive elements have a wide range of half life values.

But it is possible to measure the time taken for half of the nuclei in a radioactive material to decay.

It can also be defined as the time taken for the count rate of a sample of radioactive material to fall to half of its starting level.

When it decays to stable nickel, it emits two relatively high-energy gamma rays.

Today it is being replaced by electron beam radiation therapy systems.

The release of radiation by unstable nuclei is called radioactive decay.

This process occurs naturally and cannot be influenced by chemical or physical processes.