EMFields AM-11, User Manual

Page: 10 / 28

10
EMFs – What to measure?
What are EMFs?
EMF is usually taken to mean “time-varying electro-
magnetic field” and cover an enormous spectrum of
different phenomenon. These include, but are not
limited to, “power frequency” fields (given off by any
AC electrical device), mobile communication signals,
TV and radio signals, military radars, infra-red, visible
light, ultra-violet, x-rays and gamma rays. We
provide a brief over-view guide on the next page.
Their interaction with the human body varies and
there are few clear correlations between frequency,
duration, exposure level and health effects, though
there is a great deal of peer-reviewed published
evidence of real effects at both high and low
exposure levels. Further research into each part of
the spectrum and different modulation types is still
required. It is almost certain that sensitivity to EMF
exposure varies from person to person.
Some electric and magnetic fields are part of the
natural environment that life on Earth evolved with.
High electric fields cause lightning and magnetic
fields from the Earth’s core allow compasses to
work. However, we have not evolved with the
enormous increase over the last 100 years in
radiofrequency exposure (see graphic on page 14),
and there is steadily mounting evidence that they
may cause unexpected adverse effects on health.