| Definition: | time required for the neutron flux in a nuclear reactor to change by a factor e equal to 2,718..., when the neutron flux is rising or falling exponentially
Note 1 to entry: Doubling time is the time for the physical power to be multiplied by two, with the other parameters assumed unchanged. Note 2 to entry: This entry was numbered 393-15-19 in IEC 60050-393:2003.
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