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Section 15 - Appendix A: Health & Safety
Certification
Radio frequency electromagnetic fields may pose a health hazard when the fields are intense.
Normal fields have been studied extensively over the past 30 years with no conclusive
epidemiology relating electromagnetic fields to health problems. Detailed discussions on the
subject are contained in the references and the web sites listed below.
The USA Federal Communication Commission (FCC) and Occupational Safety and Health
Administration (OSHA) both specify acceptable levels for electromagnetic fields. Similar power
levels are mandated by corresponding agencies in other countries. Maximum permissible
exposures and time duration specified by the FCC and OSHA vary with excitation frequency.
The lowest threshold plane wave equivalent power cited is 0.2mW/cm
population over the 30 to 300MHz frequency band. All other applications and frequencies have
higher tolerances as shown graphically in Figure A-1.
Figure A-1: FCC limits for maximum permissible exposure (MPE) plane-wave equivalent power
2
density mW/cm
.
All Radiodetection Ltd GPR products are normally operated at least 1m (3') from the user and
as such are classified as "mobile" devices according to the FCC. Typical power density levels at
a distance of 1m or greater from any Radiodetection products are less than 10
Appendix A: Health & Safety Certification
59
2
for the general
-3
2
mW/cm
which
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