LG VX6100 Manual Del Usuario página 56

Safety
Safety
The FDA belongs to an interagency working group of the federal agencies
that have responsibility for different aspects of RF safety to ensure
coordinated efforts at the federal level. The following agencies belong to this
working group:
National Institute for Occupational Safety and Health
Environmental Protection Agency
Occupational Safety and Health Administration
National Telecommunications and Information Administration
The National Institutes of Health participates in some interagency working
group activities, as well.
The FDA shares regulatory responsibilities for wireless phones with the
Federal Communications Commission (FCC). All phones that are sold in the
United States must comply with FCC safety guidelines that limit RF
exposure. The FCC relies on the FDA and other health agencies for safety
questions about wireless phones.
The FCC also regulates the base stations that the wireless phone networks
rely upon. While these base stations operate at higher power than do the
wireless phones themselves, the RF exposures that people get from these
base stations are typically thousands of times lower than those they can get
from wireless phones. Base stations are thus not the subject of the safety
questions discussed in this document.
3. What kinds of phones are the subject of this update?
The term "wireless phone" refers here to handheld wireless phones with
built-in antennas, often called "cell", "mobile", or "PCS" phones. These types
of wireless phones can expose the user to measurable radiofrequency energy
(RF) because of the short distance between the phone and the user's head.
These RF exposures are limited by FCC safety guidelines that were developed
with the advice of the FDA and other federal health and safety agencies. When
the phone is located at greater distances from the user, the exposure to RF is
drastically lower because a person's RF exposure decreases rapidly with
increasing distance from the source. The so-called "cordless phones," which
have a base unit connected to the telephone wiring in a house, typically
operate at far lower power levels, and thus produce RF exposures far below
the FCC safety limits.
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4. What are the results of the research done already?
The research done thus far has produced conflicting results, and many studies
have suffered from flaws in their research methods. Animal experiments
investigating the effects of radiofrequency energy (RF) exposures characteristic
of wireless phones have yielded conflicting results that often cannot be repeated
in other laboratories. A few animal studies, however, have suggested that low
levels of RF could accelerate the development of cancer in laboratory animals.
However, many of the studies that showed increased tumor development used
animals that had been genetically engineered or treated with cancer-causing
chemicals so as to be pre-disposed to develop cancer in the absence of RF
exposure. Other studies exposed the animals to RF for up to 22 hours per day.
These conditions are not similar to the conditions under which people use
wireless phones, so we don't know with certainty what the results of such studies
mean for human health. Three large epidemiology studies have been published
since December 2000. Between them, the studies investigated any possible
association between the use of wireless phones and primary brain cancer,
glioma, meningioma, or acoustic neuroma, tumors of the brain or salivary
gland, leukemia, or other cancers. None of the studies demonstrated the
existence of any harmful health effects from wireless phone RF exposures.
However, none of the studies can answer questions about long-term exposures,
since the average period of phone use in these studies was around three years.
5. What research is needed to decide whether RF exposure from
wireless phones poses a health risk?
A combination of laboratory studies and epidemiological studies of people
actually using wireless phones would provide some of the data that are needed.
Lifetime animal exposure studies could be completed in a few years. However,
very large numbers of animals would be needed to provide reliable proof of a
cancer promoting effect if one exists. Epidemiological studies can provide data
that is directly applicable to human populations, but 10 or more years follow-up
may be needed to provide answers about some health effects, such as cancer.
This is because the interval between the time of exposure to a cancer-causing
agent and the time tumors develop — if they do — may be many, many years.
The interpretation of epidemiological studies is hampered by difficulties in
measuring actual RF exposure during day-to-day use of wireless phones. Many
factors affect this measurement, such as the angle at which the phone is held,
or which model of phone is used.
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