The cell phone today is more ubiquitous than ever, and scientific
studies continue to try to distinguish the relationship between
cellular phones and cancer.
A recent study from the National
Institutes of Health showed increased brain activity in participants
exposed to cell phone radiation. The study used PET scans to measure the
brain's sugar level, and found increased activity in regions closest to
the phone's antenna after 50 minutes of exposure. Although the
increased activity isn't directly linked to harmful effects, the human
brain's evident sensitivity to the phone's electromagnetic waves does
raise further questions.
In May 2011, the World Health
Organization reclassified cell phone radiation exposure as "possibly
carcinogenic," a label that places it in the same category as chloroform
and lead. The most extensive case control study of cellular phones and
cancer, the Interphone study, conducted across 13 countries for a decade
found that the highest grade of mobile phone users-those who used their
phones for 30 minutes a day over 10 years or more- were twice as likely
to develop glioma, a malignant brain tumor. These results are alarming,
particularly because the study failed to take into account that
children and young adults are far more susceptible to cell phone
radiation than adults.
Cellular phone radiation testing conducted
by manufacturers also underestimates the amount of radiation that users
are exposed to. A recent paper published in the journal Electromagnetic
Biology and Medicine revealed that industry testing is done on a
mannequin modeled after a 6'2", 200 pound man with the phone held one
inch from the mannequin's ear. The study estimates that 97 percent of
the population deviate from this unrealistic model of usage and
experience greater exposure.
The Federal Communications Commission
requires a mobile phone to have a Specific Absorption Rate (SAR), a
measure of the peak of electromagnetic radiation level in a model, of
less than 1.6 watts per kilogram. However, the peak SAR may not
represent the actual SAR levels of a typical phone call. A cellular
phone with a lower SAR may expose the user to more radiation on average
than one with a higher SAR. A study conducted by a bioengineering
research professor, Dr. Henry Lai, found effects of memory loss in rats
exposed to SAR levels as low 0.0006 to 0.06 watts per kilogram.
As
of 2010, there are over 223 million mobile phone users in the US over
the age of 13 and the numbers are constantly growing. According to the
CTIA, the Wireless Association, the total minutes of cell phone use in
America in 2009 was 2.3 trillion minutes. Cellular phone users are also
starting at younger ages. Given the indispensable role of cell phones in
our lives and the increasing concern about an association between cell
phone use and cancer, regulatory agencies should carry out more thorough
investigations, and cell phone users should exercise caution and take
steps to lower their exposure to cell phone radiation.
By
Laura Yan
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