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Measurement of thermophysical properties of polyimide and a black paint for future development of cryogenic radiometers

We have measured the thermal conductivity of polyimide rod at temperatures from 2.4 K to 8 K, and the specific heats of polyimide rod and a black paint at 2.4 K and 4.4 K. It is shown that the responsivity and time constant of cryogenic radiometers can be significantly improved by the use of a polyimide film as the heat link. This study will help future development of highly sensitive absolute cryogenic radiometers.