All other isotopes have half-lives shorter than one hour, except for 231 U (half-life 4.2 days) and 240 U (half-life 14.1 hours). The shortest-lived known isotope is 221 U, with a half-life of 660 nanoseconds, and it is expected that the hitherto unknown 220 U has an even shorter half-life. [119]
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Half-life represents a date in the future when half of the total principal of a mortgage-backed security (MBS) will be paid off. It can also represent the date when half of a person's private
thCs.