| quantity such as: |
ρ = 1 – (1/ keff)
keff is the effective multiplication factor
Note 1 to entry: The parameter ρ gives the deviation from criticality of a nuclear chain reacting medium which is such that positive values correspond to a supercritical state and negative values to a subcritical state.
Note 2 to entry: This entry was numbered 393-15-42 in IEC 60050-393:2003.