Abstract
The triple point of argon is realized calorimetrically using a closed cycle refrigerator (a Gifford-McMahon type refrigerator). The usage of the closed cycle refrigerator with a closed fixed-point cell of argon is found to have a high potential for an easy-handling and the most accurate realizing method, as the temperature distribution inside the cryostat is stable enough for a long period, compared with the conventional cryostat. The standard uncertainty of this system in calibrating standard platinum resistance thermometers at the triple point of natural argon is estimated to be 0.059mK including isotopic uncertainties.
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