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detectivity, <of a detector>
reciprocal of the noise equivalent power, 
Note 1 to entry: The detectivity is expressed in watt to the power minus one (W−1).
Note 2 to entry: This entry was numbered 845-05-65 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-295 in CIE S 017:2011.