A small, high-resolution paramagnetic susceptibility thermometer was developed using a GdCl/sub 3/ paramagnetic salt. The device uses a superconducting quantum interference device (SQUID) magnetometer to determine the temperature dependent magnetization of the salt in a magnetic field. The magnetic field is provided by a pair of small samarium cobalt permanent magnet disks situated inside the thermometer housing. This eliminates the need for a heavy, charging solenoid used in a conventional SQUID-based magnetic thermometer system. This thermometer can resolve approximately 10/sup -9/ K near the liquid-gas critical point of /sup 3/He (/spl sim/3.31 K). The drift rate of the thermometer was measured to be <2/spl times/10/sup -13/ K/s. This light weight thermometer (/spl sim/7 g) is a candidate for use in future low-temperature Space Shuttle and International Space Station experiments.
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