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The range of the half-lives of radioactive atoms have no known limits and span a time range of over 55 orders of magnitude.
Radionuclides occur naturally and are artificially produced in nuclear reactors, cyclotrons, particle accelerators or radionuclide generators.
During those processes, the radionuclide is said to undergo radioactive decay. The unstable nucleus is more stable following the emission, but will sometimes undergo further decay.
Radioactive decay is a random process at the level of single atoms: it is impossible to predict when one particular atom will decay.) for that collection can be calculated from their measured decay constants.
The DNA is exceedingly rare in the soil compared with that from plants, animals, fungi and microbes.