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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. [1]
Instead, the half-life is defined in terms of probability: "Half-life is the time required for exactly half of the entities to decay on average". In other words, the probability of a radioactive atom decaying within its half-life is 50%. [2] For example, the accompanying image is a simulation of many identical atoms undergoing radioactive decay.
Douglas Adams was asked many times why he chose the number 42. Many theories were proposed, including that 42 is 101010 in base 2, that light refracts through a water surface by 42 degrees to create a rainbow, or that light requires 10 −42 seconds to cross the diameter of a proton. [10]
Mark Twain popularized the saying in Chapters from My Autobiography, published in the North American Review in 1907. "Figures often beguile me," Twain wrote, "particularly when I have the arranging of them myself; in which case the remark attributed to Disraeli would often apply with justice and force: 'There are three kinds of lies: lies, damned lies, and statistics.'" [4] [1] [2]
John Stamos and his fellow Full House alums are remembering Bob Saget two years after his death. “Hard to believe. As time moves on, that sharp pain I felt at the beginning … it’s become a ...
The list then covers the ~700 radionuclides with half-lives longer than 1 hour, split into two tables, half-lives greater than one day and less than one day. Over 60 nuclides that have half-lives too short to be primordial can be detected in nature as a result of later production by natural processes, mostly in trace amounts.
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