Radioactive decay is a random radioactive dating half life. You cannot predict when an individual nucleus will decay but with large numbers of nuclei you can use a statistical approach.
One becquerel is one decay per second. The half life is the time for half the nuclei to decay. This has implications for radioactive waste from nuclear power stations which will need to be stored safely for a very long time. Carbon-14 has a half life of 5730 years. Once a plant or animal dies its carbon-14 content gradually decreases.
Using the half life for carbon-14 and comparing the amount of carbon-14 in on ancient artifact with the amount of carbon-14 we would expect in a fresh sample today we can date an object. It has been suggested that this article be merged into List of nuclides. This is a list of radioactive isotopes ordered by half-life from shortest to longest. You can help by adding to it. Tellurium-128’s half-life is over 160 trillion times greater than the age of the universe. Radioactive isotope table «lists ALL radioactive nuclei with a half-life greater than 1000 years», incorporated in the list above. Jump to navigation Jump to search This article is about the scientific and mathematical concept.
The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay. The original term, half-life period, dating to Ernest Rutherford’s discovery of the principle in 1907, was shortened to half-life in the early 1950s. Half-life is constant over the lifetime of an exponentially decaying quantity, and it is a characteristic unit for the exponential decay equation. The accompanying table shows the reduction of a quantity as a function of the number of half-lives elapsed. The number at the top is how many half-lives have elapsed.