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Magnetic Fields
 
 

This page presents information about magnetic fields, also known as electromagnetism. Magnetic fields are one of two electromagnetic radiation elements, the other being non-ionizing radiation frequencies (RF) for wireless products or electric non-ionizing frequency fields for wired products. It should be noted the health effects attributed to power transmission lines, cell phones and other wireless product radiation have been linked to non-ionizing radiation frequencies and not magnetic fields. Click here for information about non-ionizing radiation frequencies generated by cellular phones.

Publicly available magnetic field information addresses the health effects of 50 or 60 Hz. (cycles per second) alternating (reversing) current (AC) from power transmission lines, transformers and common household electronic products. The information consistently states direct current (DC) magnetic fields are not considered a health risk because they remain static (non-alternating), while AC magnetic fields are hazardous because several epidemiological studies reported increased cancer risks associated with being exposed to them.

Some scientists, however, believe the health effects are caused by alternating frequencies and not by magnetic fields. This is a logical conclusion when one considers the health effects attributed to cell phone and other non-ionizing radiation sources are identical to those associated with 50 - 60 Hz. electric and magnetic fields.

AegisGuard Life (L) Series Radiation Shields protect users from RF generated by wired and wireless products and networks, regardless of the source and what may be contained within them, by shielding users from unwanted frequencies and their contents.

Magnetic field measurements are expressed as gauss, milligauss, tesla, microtesla and millitesla. The following table presents the relationship between these measurements.

1 gauss = 0.0001 tesla = 0.1 millitesla = 100 microtesla
1 tesla = 10,000 gauss = 10,000,000 milligauss = 10,000,000,000 microgauss

Man has evolved naturally in the earth’s 500 milligauss magnetic field without experiencing any negative health effects from these fields. In modern society, it has been proven countless times there are no health risks when man is exposed to magnetic energy sixty thousand times more powerful than that of the earth, such as during an 3.0 Tesla 3 hour MRI test.

The magnetic fields for several common electronic products found in the home are presented in the following table:

Magnetic Fields (milligauss)
Product At The Head** 4 inches From The Body*
Cellular Phone 1.2 to 2 N/A
Coffee Maker N/A 2.3 to 3
Alarm Clock N/A 5 to 15
Toaster N/A 10 to 60
Iron N/A 12 to 45
Vacuum Cleaner N/A 230 to 1300
Hair Dryer N/A 3 to 1400
Television N/A 4.8 to 100
Source: Gauger, Jr., Household Appliance Magnetic Field Survey. IEEE transactions on power apparatus and systems. PA-104
** Source: Medical College of Wisconsin

There have been studies suggesting long term power transmission line and transformer magnetic field exposure can cause diseases such as leukemia, yet it has never been determined if these occurrences are due to magnetic fields or radiation frequencies. The following table presents the magnetic fields measured from different voltage levels at various distances from transmission lines:

Magnetic Fields (milligauss)
Voltage* Under Wires Edge Of Right-Of-Way At 100 Feet
69 kilovolts 20 to 25 5 to 10 0.5 to 12
138 kilovolts 35 to 40 15 to 20 0.5 to 12
345 kilovolts 85 to 100 50 to 60 0.5 to 12
* Assumes Normal Current Flow

2 milligauss background magnetic fields are found in most homes and offices within 300 feet (91 meters) of power lines and transformers.
 


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