inhour

(nucleonics) A unit of reactivity of a reactor; 1 inhour is the reactivity that will give the reactor a period of 1 hour. Derived from inverse hour.

[Etymology: inverse hour] sub-atomic physics USA For the activity of a nuclear reactor, the inverse of its period in hours.
[Anderson H. L., Fermi E., Wattenberg A., Weil G. L., Zinn W. H. Phys. Rev. Ser. 2 Vol. 72, 16-23 (1947)] See also dollar; nile.