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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 longest-lived isotope is 247 Cm, with half-life 15.6 million years – orders of magnitude longer than that of any known isotope beyond curium, and long enough to study as a possible extinct radionuclide that would be produced by the r-process. [2] [3] The longest-lived known isomer is 246m Cm with a half-life of 1.12 seconds.
Curium-250 is the isotope with the lowest atomic number that primarily decays by spontaneous fission, a process that releases many times more energy than alpha decay. Compared to plutonium-238, curium-250 provides about a quarter of the power density, but 95 times the half-life (~8300 years vs. ~87 years).
An atomic battery, ... this field of research got much attention for applications requiring long-life power sources for spacecraft. ... curium-242, curium-244 and ...
The biological half-life of curium is about 20 years in the liver and 50 years in the bones. [52] [54] Curium is absorbed in the body much more strongly via inhalation, and the allowed total dose of 244 Cm in soluble form is 0.3 μCi. [13]
An atomic battery (also called a ... curium-242, curium-244 and strontium-90 have been used. Tritium, nickel-63, ... It has a half-life of 87.7 years, reasonable ...
Plutonium-239 has a half-life of 24,110 years. [1] Nuclear properties. The nuclear properties of plutonium-239, ... curium-243 americium-239 ...
The high short-term radioactivity of spent nuclear fuel is primarily from fission products with short half-life.The radioactivity in the fission product mixture is mostly due to short-lived isotopes such as 131 I and 140 Ba, after about four months 141 Ce, 95 Zr/ 95 Nb and 89 Sr constitute the largest contributors, while after about two or three years the largest share is taken by 144 Ce/ 144 ...