Geological Survey Calibration Blocks

Magnesium Elektron is the world leader in the development and supply of highly functional magnesium alloys. Magnesium Elektron’s A31B Calibration Blocks have been supplied into the Oil and Gas Industry since density logging was developed in the 1950’s. Paired with matching aluminum blocks, Magnesium Calibration Blocks are used to calibrate borehole logging tools that measure density based on gamma-ray scattering.

Product Forms

  • Cast slab raw material
  • Fully machined to customer drawings
  • Fully machined and coated to customer specifications


  • Gamma Ray Logging
  • Nuclear Logging