The establishment of an absolute temperature scale using noise and nuclear orientation thermometry

The present status of a comparison of the temperatures obtained from a Josephson junction noise thermometer and a 60Co γ-ray anisotropy thermometer is reported on. The data reported here cover the range of 12 to 35mK in 16 steps varying from approximately 0.5 to approximately 2mK. Owing to improvements in: temperature stability of the dilution refrigerator, analysis of noise thermometer data, and the γ-ray data acquisition system, these new results have considerably less scatter than those reported previously. The overall agreement between both thermometers is about 1%. (Auth.)