Emittance

A surveyor had come out and done checks, explained the readings, confirmed that there was less emittance from the lines than a microwave could give off.

Also, the peak emittance wavelength of black-body radiation shifts to infinity at absolute zero; indeed, a peak no longer exists and black-body photons can no longer escape.

The top of a Planck curve ( the peak emittance wavelength ) is located in a particular part of the electromagnetic spectrum depending on the temperature of the black-body.