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Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above. The NUBASE2020 evaluation of nuclear physics properties F.G. Kondev et al. 2021 Chinese Phys. C 45 030001. The PDF of this article lists the half-lives of all known radioactives nuclides.
In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on.
with half-life 122.266(43) s and 14 O with half-life 70.621(11) s. All remaining radioisotopes have half-lives less than 27 s and most have half-lives less than 0.1 s. The four heaviest known isotopes (up to 28 O) decay by neutron emission to 24 O, whose half-life is 77.4(4.5) ms. This isotope, along with 28 Ne, have been used in the model of ...
220 Rn, also called thoron, is a natural decay product of the most stable thorium isotope (232 Th). It has a half-life of 55.6 seconds and also emits alpha radiation. Similarly, 219 Rn is derived from the most stable isotope of actinium (227 Ac)—named "actinon"—and is an alpha emitter with a half-life of 3.96 seconds. [38] The radium or ...
Natural isotopes are either stable isotopes or radioactive isotopes that have a sufficiently long half-life to allow them to exist in substantial concentrations in the Earth (such as bismuth-209, with a half-life of 1.9 × 10 19 years, potassium-40 with a half-life of 1.251(3) × 10 9 years), daughter products of those isotopes (such as 234 Th, with a half-life of 24 days) or cosmogenic ...
This element also has 19 meta states, of which the most stable is 58m1 Co with a half-life of 8.853 h. The isotopes of cobalt range in atomic weight from 50 Co to 78 Co. The main decay mode for isotopes with atomic mass less than that of the stable isotope, 59 Co, is electron capture and the main mode of decay for those of greater than 59 ...
The most stable known roentgenium isotope, 282 Rg, is also the heaviest known roentgenium isotope; it has a half-life of 100 seconds. The unconfirmed 286 Rg is even heavier and appears to have an even longer half-life of about 10.7 minutes, which would make it one of the longest-lived superheavy nuclides known; likewise, the unconfirmed 283 Rg ...
In the case of the hydrogen isotope tritium (half-life = 12.3 years) and carbon-14 (half-life = 5,730 years), these isotopes derive their importance from all organic life containing hydrogen and carbon and therefore can be used to study countless living processes, reactions, and phenomena.