http://www.sciencenews.org/articles/20030222/fob1.asp
Hold the Phone? Radiation from cell phones hurts rats' brains
Kendall Morgan
A single 2-hour exposure to the microwaves emitted by some cell phones
kills brain cells in rats, a group of Swedish researchers claims. If
confirmed, the results would be the first to directly link cell-phone
radiation to brain damage in any animal.
HANG UP? Radiation emitted by cell phones kills brain cells in rats.
No such evidence exists for people. But with cell-phone use
skyrocketing, some scientists recommend precautionary measures—for
example, avoiding excessive gabbing on the phones.
Digital cell phones send out compressed information through microwave
pulses of electromagnetic radiation. In the United States, standard
phones emit 50 such pulses per second, while so-called
GSM
phones—which operate under the international standard called Global
System for Mobile Communications—emit 217. Those pulses scatter
low-level microwave radiation across the brain. To date, convincing
evidence linking the phones to serious health problems, such as
cancer, is lacking, says Leif G. Salford of Lund University Hospital
in Sweden.
Even so, he and his colleagues are still looking for such connections.
About 10 years ago, they showed that cell-phone radiation causes the
protective barrier in rats' brains to leak, permitting blood proteins
that are normally kept away from brain tissue to contact neurons.
Now, Salford's team reports in a forthcoming Environmental Health
Perspectives that this breach of the so-called blood-brain barrier is
accompanied by the death of brain cells.
Adolescent rats were exposed for 2 hours to
GSM phones at one of three
power levels: 0.01, 0.1, or 1 watt (W). Rats in a control group were
not exposed. Cell phones typically operate at a peak output power of
0.6 W.
Examination of the animals' brain tissue 50 days later revealed that
up to 2 percent of the brain cells of rats that had received
cell-phone radiation exposures of 0.1 watt or greater were dead or
dying. The hippocampus, cortex, and brain stem suffered the most
damage. The other groups showed no significant brain-cell death.
Salford cautions that the results may not apply to real-world
cell-phone use. On the other hand, he notes, "there might be negative
consequences in the long run."
Previous studies have shown a variety of biological effects of cell
phone-type radiation, but no convincing evidence of health damage (SN:
6/29/02, p. 404:
http://sciencenews.org/20020629/fob3.asp; 5/20/00,
p.326: Available to subscribers at
http://sciencenews.org/20000520/fob5.asp; 2/12/00, p. 100:
http://www.sciencenews.org/20000212/fob1.asp).
Henry C. Lai of the University of Washington in Seattle finds
Salford's new results "quite intriguing." He says, "The energy
absorbed by the rats was really low compared to what a person gets
when using a cell phone." Particularly if the effects add up over
time, Lai says, regular use of cell phones could be problematic.
And it's not just the phones. In the modern, wireless office, people
are increasingly exposed to a "sea of microwaves," says neuroscientist
W. Ross Adey of Loma Linda University in California. "You have to ask,
How much can people handle before it becomes a significant problem?"
he says.
For the record, Salford himself does use a cell phone. To limit his
exposure, however, he cuts calls short and distances himself from the
phone with a hands-free headset.
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Help Reduce Your Brain's Exposure to Cell Phone Radiation: This
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Although the cell phone industry continues to claim that their
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Proven Protection from Cell Phone RFs!
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In essence, your cell phone is a radio. When you talk on your cell
phone, your voice is transmitted from the antenna as radio frequency
radiation (RFR) between 800 MHz and 1,990 MHz. This frequency falls in
the range of microwave radiation and, when you are exposed to it,
there may be a chance of health consequences.
Depending on how close the cell phone antenna is to your head, between
20% and 60% of the radiation emitted by your cell phone is transferred
into your head. The radiation actually penetrates the area around your
head and is absorbed, with some radiation reaching an inch, to an inch
and a half, into your brain.
Cell phones are designed to transmit radio waves in all directions
because base stations can be located in any direction with respect to
phone users. This means that portions of the radio waves they produce
are directed towards your body. The diagram of the person and the
radio tower illustrates how this can occur.
Potential Health Concerns Caused By Radiation
There have been a number of contradictory reports made as to the
overall effects cell phones can have on your health. However, a report
in the prestigious medical journal The Lancet, considered the most
comprehensive and well-referenced report on this topic to date, warns
that the potential problems from cell phones can NOT be dismissed.
Combined with the growing body of evidence we are seeing in addition
to this study, the information available today, on the potential
effects of cell phones, gives strong support to the notion that cell
phones may affect multiple facets of your brain function, behavior and
health in general.
Headsets: Not As Safe As You Thought
Since radiation decreases exponentially, (one over the square root
over the distance between you and you phone) we thought by using a
headset so you could hold the phone away from your body would solve
the problem. However, recent investigations tell us that headsets may
actually intensify your exposure to harmful EMFs emitted by your cell
phone.
Contrary to popular belief, research conducted by British consumer
research magazine Which? indicates that hands-free cell phone kits may
significantly INCREASE your brain's exposure to radiation. The
findings confirmed claims that that using hands-free earpieces in
certain positions could more than TRIPLE your brain's exposure to
radiation compared to a conventional cell phone call.
By itself, headset can act as an antenna that actually channels
radiation to your brain.
Ferrite Beads May Help Block Radio Frequencies
So as you now know, I believe that the danger of using cell phones is
very real. I have known of this for a quite some time now but didn't
really have great options to offer.
If you are one of the lucky ones that have a cell phone that can work
on speakerphone then you already have your solution. You just need to
use your speakerphone. Doing so will greatly decrease your exposure to
both EMFs and radio frequencies (RF).
However, using a speakerphone can present a problem if you are in a
noisy environment or it just isn't convenient to use. If this is a
case, you can use a ferrite bead attached to your headset as another
option.
While they do not block EMFs, ferrite beads are an effective solution
to limit unwanted RF interference, which may help decrease their
tissue-heating effects on your brain.