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This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
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. [7]
10 + 1 ⁄ 3 inches (262 mm) 7 + 17 ⁄ 50 inches (186 mm) 2 + 3 ⁄ 4 inches (70 mm) 2 + 15 ⁄ 16 inches (75 mm) 3 + 1 ⁄ 8 inches (79 mm) 3 + 5 ⁄ 16 inches (84 mm) 3 + 1 ⁄ 2 inches (89 mm) 3 + 11 ⁄ 16 inches (94 mm) 3 + 7 ⁄ 8 inches (98 mm) 4 + 1 ⁄ 16 inches (103 mm) 4 + 1 ⁄ 4 inches (108 mm) 4 + 7 ⁄ 16 inches (113 mm) 4 + 5 ...
4 in × 1 in × 5 + 3 ⁄ 4 in (102 mm × 25 mm × 146 mm) = 377 cm 3. This smaller form factor is similar to that used in an HDD by Rodime in 1983, which was the same size as the "half height" 3 + 1 ⁄ 2 in (89 mm) FDD, i.e., 1.63 inches (41 mm) high. Today, the 1-inch high ("one-third height", "slimline", or "low-profile") version of this ...
1.6 × 10 −5 quectometers (1.6 × 10 −35 meters) – the Planck length (Measures of distance shorter than this do not make physical sense, according to current theories of physics.) 1 qm – 1 quectometer, the smallest named subdivision of the meter in the SI base unit of length, one nonillionth of a meter.
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The predicted double beta decay of 160 Gd has never been observed; only a lower limit on its half-life of more than 1.3×10 21 years has been set experimentally. [ 5 ] Thirty-three radioisotopes have been characterized, with the most stable being alpha-decaying 152 Gd (naturally occurring) with a half-life of 1.08×10 14 years, and 150 Gd with ...
Between 600 and 800 days after SN1987A occurred, the bolometric light curve decreased at an exponential rate with half-life values from τ 1/2 = 68.6 days to τ 1/2 = 69.6 days. [6] The rate at which the luminosity decreased closely matched the exponential decay of 56 Co with a half-life of τ 1/2 = 77.233 days.