quantity such as: ρ = 1 – (1/ keff) where 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.
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