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In this paper we report a detailed investigation of a number of differentmaterials commonly used in precision instrumentation in the view of using themas critical components in the magnetic gradiometer. The materials requirementinside a magnetic gradiometer is stringent because the presence of magneticsusceptible material will introduce intrinsic errors into the device. Manycommercial grade non-magnetic materials still have unacceptably high levels ofvolume magnetic susceptibility between 0.001 and 0.0001. It is shown here thatmachining with steel tools can further increase the susceptibility by up to anorder of magnitude. The ability of an acid wash to remove this contamination isalso reported. Washing in acid is shown to reduce the variation of volumesusceptibility in several commercial grade plastics which already have lowvalues of susceptibility.

Reducing the magnetic susceptibility of parts in a magnetic gradiometer