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Naturally occurring cerium (58 Ce) is composed of 4 stable isotopes: ... with a half-life of 284.893 days; 139 Ce, with a half-life of 137.640 days and 141 Ce, ...
The most stable of them are 144 Ce with a half-life of 284.9 days, 139 Ce with a half-life of 137.6 days, and 141 Ce with a half-life of 32.5 days. All other radioactive cerium isotopes have half-lives under four days, and most of them have half-lives under ten minutes. [21]
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.
Slightly radioactive elements: the most stable isotope is very long-lived, with a half-life of over two million years. Radioactive elements: the most stable isotope has half-life between 800 and 34,000 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.
3.1 abundance, half-life trace, synthetic, stable by keyboard code. ... Main isotopes of cerium; Main isotopes [1] Decay; abundance half-life (t 1/2) mode product ...
Caesium-137 (137 55 Cs), cesium-137 (US), [7] or radiocaesium, is a radioactive isotope of caesium that is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons.
243 Cm with a ~30-year half-life and good energy yield of ~1.6 W/g could be a suitable fuel, but it gives significant amounts of harmful gamma and beta rays from radioactive decay products. As an α-emitter, 244 Cm needs much less radiation shielding, but it has a high spontaneous fission rate, and thus a lot of neutron and gamma radiation.