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The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of the amount of unstable material to degrade into a more stable material. For example, a source will have an intensity of 100% when new. At one half-life, its intensity will be cut to 50% of the original intensity.
Over the next 2 days 2500 of the remaining radioactive nuclei undergo decay. This is half of the remaining 5000 radioactive nuclei. The isotope undergoes further decay and it takes 2 days for the number of radioactive nuclei to halve in number. The half life for this radioisotope is 2 days.Therefore the number of radioactive nuclei is always half the number there was 2 days ago.his 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. 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.