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 Extremely
low frequency (ELF) radiation includes alternating current (AC)
fields and other electromagnetic, non-ionizing radiation from
1 Hz to 300 Hz. ELF radiation at 60 Hz are produced by power lines,
electrical wiring, and electrical equipment.
Current research has focused on potential health effects of magnetic
fields because some epidemiological studies have suggested increased
cancer risk associated with estimates of magnetic field exposure.
Exposure to EMFs depends on the strength of the ELF at the source,
the distance from the source, and the duration of exposure. The
(ACGIH) has established occupational exposure guidelines for ELF
radiation.
| Guidelines
for EMF Exposure |
| International
Commission on Non-Ionizing Radiation Protection |
| Exposure--50/60 |
Electric Field |
Magnetic Field |
| Occupational |
Whole working day
Short-term*
Limbs |
10 kV/m
30 kV/m
- |
5 G (5,000 mG)
50 G (50,000 mG)
250 G (250,000 mG) |
| General Public |
| Up to 24 hours per day |
5 kV/m |
1 G (1,000 mG) |
| Few hours per day |
10 kV/m |
10 G (10,000 mG) |
*For electric fields of 10-30
kV/m, field strength (kV/m) multiplied by hours of exposure
should notexceed 80 for the whole working day. Whole-body
exposure to magnetic fields up to 2 hours per day should not
exceed 50 G.
Source: ICNIRP 1994 |
The International Commission on
Non-Ionizing Radiation Protection (ICNIRP) is an organization
of 15,000 scientists from 40 nations who specialize in radiation
protection.
| Guidelines
for EMF Exposure |
| Threshold Limit Values
for EMF Exposure American Conference of Governmental Industrial
Hygienists |
| Exposure--60 Hz |
Electric field |
Magnetic field |
| Occupational |
Levels should not exceed
Workers with cardiac pacemakers |
25 kV/m* (from 0 to 100 Hz
1 kV/m or below |
10 G (10,000 mG)
1 G (1,000 mG)
|
*Prudence dictates
the use of protective devices (e.g. suits, gloves, insulation)
in fields above 15 kV/m.
Source: ACGIH 1996 |
The American Conference of Governmental Industrial
Hygienists (ACGIH) is a professional organization that facilitates
the exchange of technical information about worker health protection.
It is not a government regulatory agency.
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