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Half-Lives for Several Radioactive Isotopes (uses column: Chemistry 2e Table 21.2)","https://openstax.org/books/chemistry-2e/pages/m-half-lives-for-several-radioactive-isotopes","CC BY 4.0",[337,338,339,340,341,342],"Half-life units: y = years, d = days, h = hours, m = minutes, s = seconds. Emission codes: E.C. = electron capture, S.F. = spontaneous fission.","Decay is first-order: N = N₀(1/2)^(t/t½), and t½ = ln 2 / k regardless of the starting amount.","Dating windows follow the half-life: carbon-14 (5730 y) dates once-living material to about 50,000 years; uranium-238 (4.47 × 10⁹ y) dates rocks on geologic timescales.","Technetium-99m is a METASTABLE nuclear state (the m) of technetium-99 — the workhorse of diagnostic imaging, reached from molybdenum-99 generators.","Starred entries are curated corrections of source misprints: dubnium-260 is printed under its pre-1997 name hahnium (Ha); plutonium-240 is printed as a second plutonium-239 (its 6.54 × 10³ y half-life identifies Pu-240); technetium-99m's half-life is 6.01 h, the ChemWhiz course value (also the IAEA value), where the printed table gives 8.01 h.","ChemWhiz problems that need a half-life supply the value in the problem statement; this table is the general reference.",[344,345,346],"atomic-structure-and-isotopes","chemical-kinetics","nuclear-chemistry",[348,349,350,351,352,353,354,355],"C","U","I","Co","Tc","Ra","Rn","Sr",[357,358,359,360,361,362,363,364],"half life table","radioisotope half lives","carbon-14 half life","uranium-238 half life","radioactive decay modes","technetium-99m","iodine-131 half life","radiometric dating",1785108608503]