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Coso artifact in 2018. The Coso artifact is an object falsely claimed by its discoverers to be a spark plug encased in a geode.Discovered on February 13, 1961, by Wallace Lane, Virginia Maxey, and Mike Mikesell while they were prospecting for geodes near the town of Olancha, California, it has long been claimed as an example of an out-of-place artifact. [1]
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 nuclear physics, the island of stability is a predicted set of isotopes of superheavy elements that may have considerably longer half-lives than known isotopes of these elements. It is predicted to appear as an "island" in the chart of nuclides , separated from known stable and long-lived primordial radionuclides .
The heat production from radioactive decay drops quickly, as the short half-life isotopes provide most of the heat and radioactive decay, with the curve of decay heat being a sum of the decay curves of numerous isotopes of elements decaying at different exponential half-life rates.
Of the 35 synthetic radioactive isotopes that are known, the most stable one is holmium-163 (163 Ho), with a half-life of 4570 years. [24] All other radioisotopes have ground-state half-lives not greater than 1.117 days, with the longest, holmium-166 (166 Ho) having a half-life of 26.83 hours, [25] and most have half-lives under 3 hours.
In geotechnical engineering, a tieback is a structural element installed in soil or rock to transfer applied tensile load into the ground. Typically in the form of a horizontal wire or rod, or a helical anchor, a tieback is commonly used along with other retaining systems (e.g. soldier piles , sheet piles, secant and tangent walls) to provide ...
Lutetium is a rare-earth element, with one naturally-occurring stable isotope 175 Lu and one naturally-occurring radioactive isotope 176 Lu. [3] When 176 Lu atoms are incorporated into earth materials, such as rocks and minerals, they began to be "trapped" while starting to decay. [4]