In recent radiometric measurements of thermodynamic temperature T and the difference T -T6* at a series of temperatures in the range -4 0 ° C to + 100 "C, the present authors [ 1, 21 used a blackbody radiator whose whole internal surface was coated with a black paint (3M-C401, Nextel).To extend those measurements above 100 " C .while
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Quinn et al. (1986) studied this question.