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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.
The Black Mesa Research Facility (also simply called Black Mesa) is a fictional underground laboratory complex that serves as the primary setting for the video game Half-Life and its expansions, as well as its unofficial remake, Black Mesa. It also features in the wider Half-Life universe, including the Portal series.
Periodic table with elements colored according to the half-life of their most stable isotope. Elements which contain at least one stable isotope. Slightly radioactive elements: the most stable isotope is very long-lived, with a half-life of over two million years.
The isobar forming 132 Te/ 132 I is: Tin-132 (half-life 40 s) decaying to antimony-132 (half-life 2.8 minutes) decaying to tellurium-132 (half-life 3.2 days) decaying to iodine-132 (half-life 2.3 hours) which decays to stable xenon-132. The creation of tellurium-126 is delayed by the long half-life (230 k years) of tin-126.
Among the known synthetic radioactive isotopes; the most stable one is 163 Ho, with a half-life of 4,570 years. All other radioisotopes have half-lives not greater than 1.117 days in their ground states (although the metastable 166m1 Ho has a half-life of about 1,200 years), and most have half-lives under 3 hours.
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.
In addition, there are 34 known synthetic radioisotopes, the most stable of which is 182 Hf with a half-life of 8.9 × 10 6 years. This extinct radionuclide is used in hafnium–tungsten dating to study the chronology of planetary differentiation. [5] No other radioisotope has a half-life over 1.87 years. Most isotopes have half-lives under 1 ...
Naturally occurring thulium (69 Tm) is composed of one stable isotope, 169 Tm (100% natural abundance).Thirty-nine radioisotopes have been characterized, with the most stable being 171 Tm with a half-life of 1.92 years, 170 Tm with a half-life of 128.6 days, 168 Tm with a half-life of 93.1 days, and 167 Tm with a half-life of 9.25 days.