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A monochromator was modified to measure the emissivity, ε(λ), of living tissue in the infrared region between 1 and 14 μm. The infrared radiation from the tissue was compared with blackbody radiation and in this way ε(λ) has been determined for white skin, black skin, burnt skin and pericardium.
J. A. Steketee (Sat,) studied this question.