Micro-magnetic susceptometer for the actinides

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6581776

Nave, S E; Huary, P G

A D.C. magnetic susceptometer incorporating a SQUID as a magnetic flux sensor has been constructed with sensitivity to measure the magnetic susceptibility of submicrogram actinide samples as a function of temperature. For a two microgram actinide sample the minimum measurable dimensionless susceptibility is approximately 10/sup -7/ CGS in a 2000 gauss field. The sensitivity has been determined in a series of calibration experiments using samples of lead spheres at 4.2/sup 0/K. Pick-up coils insensitive to changes in spatially uniform fields and fields with a constant first derivative were used to reduce noise. The field was trapped in a niobium cylinder to produce a uniform stable applied field. The flux produced by the sample in the pick-up coils is proportional to the magnetic susceptivility of the sample and is a function of the sample position.

• Research Organization: Tennessee Univ., Knoxville (USA); Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6581776
• Report Number(s): CONF-780823-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
420201 -- Engineering-- Cryogenic Equipment & Devices
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACTINIDES
CALIBRATION STANDARDS
ELECTRONIC EQUIPMENT
ELEMENTS
FLUXMETERS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MEASURING INSTRUMENTS
METALS
MICROWAVE EQUIPMENT
PHYSICAL PROPERTIES
SQUID DEVICES
STANDARDS
SUPERCONDUCTING DEVICES
TEMPERATURE DEPENDENCE