In December 2001, VitaTech was contacted by the State University of New York (SUNY) to record and analyze AC extremely low frequency (ELF) magnetic fields emanating into office spaces in a Biomedical Research Building in Buffalo, New York.
Presented are the Biomedical Research Center floor and 1- meter peak and average magnetic flux density levels as recorded in the contour surveys of Office 143, Office 145, Office 147, and hallway:
| Locations |
On Floor Peak |
Floor Avg. |
1-Meter Peak |
1-Meter Avg. |
| Office 143 |
7.4 mG |
3.93 mG |
3.6 mG |
2.14 mG |
| Office 145 |
27.7 mG |
19.3 mG |
11.7 mG |
8.29 mG |
| Office 147 |
114 mG |
71.8 mG |
27.6 mG |
20.6 mG |
| Hallway |
|
|
12.1 mG |
4.45 mG |
Field levels were also recorded directly inside the Main Electrical Room (transformer & switchgear) which were as follows:
| Location |
1-Meter Peak |
1-Meter Avg. |
| Main Electrical Room |
484 mG |
81.9 mG |
On 4 June 2002, VitaTech was contracted by a New
York State University to design, install, test and certify a
AC ELF magnetic shield. Between August 1st and August 3rd, VitaTech
installed a 1280 sq.ft. dual-substrate shield. Low (0.1-9.99
mG),
elevated (10-99 mG), and high (100-140 mG) AC ELF magnetic field
emissions that emanated into three offices located above an electrical
switchgear & transformer vault were shielded to reduce the magnetic fields to acceptable levels.
Project Data
Before
Shield Site Survey 3-D Contour Plot of Site Before AC
ELF Magnetic Shield Installed
After
Shield Site Survey
3-D Contour Plot of Site After AC ELF Magnetic Shield Installed
 Slideshow
Magnetic Shield Images
Before Shield
1,280 square-foot dual-substrate shield consisted of three adjacent university
offices located directly above a switchgear/transformer room.
.
After Shield
The windows were left untreated but still maintained an acceptable rate of
decay from the switchgear room below. The installed shield complied with
and exceeded the performance guarantee of 5 mG |
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