SC39 - Summary
17 Jun 2011



Code Summary





  • Injury from flying objects.
  • Problems with metallic implants or electronic medical devices.

Roles Affected

  • Staff, contractors and users working in the vicinity of magnetic fields


Static magnetic fields are used in a range of applications across the STFC sites, for example superconducting magnets in NMR machines or permanent magnets in particle accelerators. The code aims to minimise so far as is reasonably practicable, the health and safety risks to staff and other persons who may be affected by static magnetic fields.

While the biological affects of strong static magnetic fields are subject to current debate and investigation there are clear hazards associated with such fields arising from their impact on implanted medical devices, specifically magnetic or electronic devices for example pace makers, and their ability to attract magnetisable objects at distance and speed (projectile and crush incidents).

This code applies to all static magnetic fields in areas readily accessible to people. The code requires the establishment of documented procedures for work in and control of access to areas where fields greater than 0.2T are present, and the posting of hazard warning signs at the boundary of areas with magnetic fields greater that 0.5mT (5 Gauss).​

Contact: Baker, Gareth (STFC,DL,CSD)