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Physics > Radioactive Isotopes

Each radioactive isotope has its own decay pattern. The rate at which an isotope decays is known as its half-life. The term half-life is defined as the time it takes for half of the atoms of a particular radioactive material to disintegrate. Half lives of radioactive isotopes vary greatly from milliseconds to thousands of millions of years.

Radioisotope Half-life
BPolonium-215 0.0018 seconds
Bismuth-212 60.5 seconds
Sodium-24 15 hours
Iodine-131 8.07 days
Cobalt-60 5.26 years
Radium-226 1600 years
Uranium-238 4.5 billion years