Installation and Operation Safety 2
400/54 Premium Shielded NMR Magnet System Product Overview 15
Magnetic Field Safety Requirements
Control the hazards described in the previous sections of
this document by establishing two secure and clearly marked
zones:
• The Exclusion Zone
• The Magnetic Attraction Zone
Exclusion Zone (5-gauss line)
The exclusion zone comprises the area (rooms and hallways
for example) inside the 5- gauss line of the magnet. Prevent
individuals with cardiac or other mechanically active
implants from entering this area.
The magnetic field surrounds the magnet in a
three- dimensional fashion. Limit access and warn individuals
who are potentially at risk, not only at the same floor as the
magnet, but also at the levels above and below the magnet.
Enforce the exclusion zone with a combination of warning
signs and physical barriers. The following figure shows the
warning sign recommended by Agilent Technologies.
National and state legislation & requirements differ around the world. In
the USA, follow the requirements and guidance issued by the Food & Drug
Administration (FDA). In Europe, European Commission (EC) Directive
2004/40/EC applies; follow the guidance issued by the International
Commission on Non Ionizing Radiation Protection (ICNIRP).
Before 1st April 2005, the advisory body for the United Kingdom was the
National Radiological Protection Board (NRPB) - a member of ICNIRP.
From 1st April 2005 the NRPB merged with the United Kingdom Health
Protection Agency (HPA), and became its Radiation Protection Division.
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