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EMF Spot Measurements
The data summarized in this table came from various sources, all of which are listed in the References section.
Industry and SourcesELF magnetic fields
measured in mG
CommentsOther
frequencies
Mechanical equipment used in manufacturing
Electric resistance heater6000 - 14,000Tool exposures measured at
operator's chest
VLF
Induction heater10 - 460High VLF
Hand-held grinder3000
Grinder110
Lathe, drill press, etc.1 - 4
Electrogalvanizing
Rectification room2000 - 4600Rectified DC current (with an
ELF ripple) galvanizes metal parts
High static fields
Outdoor electric line
 and substation
100 - 1700
Aluminum refining
Aluminum pot rooms3.4 - 30Highly-rectified DC current (with an
ELF ripple) refines aluminum
Very high static field
Rectification room300 - 3300High static field
Steel foundry
Ladle refinery
 ladle electrodes active
170 - 1300Highest ELF field was at the
chair of control room operator
High ULF from the ladle's
big magnetic stirrer
 electrodes inactive0.6 - 3.7
Electrogalvanizing unit2 - 1100High VLF
Television broadcasting
Video cameras
 (studio and minocam)
7.2 - 24Measured 1 ft. awayVLF
Vidio tape degaussers160 - 3300
Light control centers10 - 300Walk-through survery
Studio and newsrooms2 - 5
Telecommunications
Relay switching racks1.5 - 32Measured 2 in. - 3 in. from relaysStatic fields and
ULF-ELF transients
Switching rooms (relay &
 electronic switches
0.1 - 1300Walk-through surveyStatic fields and
ULF-ELF transients
Undreground phone vault3 - 5Walk-through survey
Hospitals
Intensive care unit0.1 - 220Measured at nurse's chestVLF
Post-anesthesia care unit0.1 - 24VLF
Magnetic resonance
 imaging (MRI)
0.5 - 280Measured at technician's
work locations
Very high static field,
VLF and RF
Government offices
Desk work locations0.1 - 7Peaks due to laser printers 
Desks near power center18 - 50
Power cables in floor15 - 170
Computer center0.4 - 6.6
Can opener3000Appliance fields measured
6 in. away
Desktop cooling fan1000
Other office appliances10 - 200
Building power supplies25 - 1800
Information about the magnitude of other frequencies measured can be found in the original reports from which data for this table were drawn. They are listed in the References section.

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