The establishment of a temperature scale from 0.01 K to 0.05 K using noise and 60Co γ-ray anisotropy thermometers

We report here on our latest intercomparison of the Josephson junction noise thermometer and 60 Co γ-ray anisotropy thermometer from 0.01 K to 0.05 K. These results show both thermometers are in agreement to better than 0.5%. This is an improvement over our previous data and is due mainly to better temperature control and advances in instrumentation.