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Study: Cellphones Don't Cause Brain Cancer in Adults, But What of Children?

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Says children absorb more cellphone radiation than adults.

In the largest study yet of its kind, published in the "British Medical Journal," Danish researchers have found no correlation between use of cellphones and risk for brain tumors in adults.

According to Science Daily, more than 358,400 cellphone users were monitored during an 18-year period. The researchers from Institute of Cancer Epidemiology in Copenhagen evaluated the entire Danish population 30 years or older, and classified them as cellphone users or non-cellphone users before 1995. The study period ranged from 1990 to 2007.

Although 10,729 central nervous system tumors were reported during the study period, researchers said that those using cellphones for the longest period of time, 13 or more years, had similar cancer rates to those who reported not using a cellphone.

According to Science Daily, the researchers do state that even though this study period is the longest evaluating such a group, cellphones correlating with cancer risk after 10 to 15 years could still be a possibility.

But this study focused on adults. Children younger and younger are beginning to use and even own their own cellphones now and a separate study, recently published in "Electromagnetic Biology and Medicine Journal," reports finding that children absorb more cellphone radiation than adults.

The study authors from the Environmental Health Trust report that the existing model to measure radiation absorption is on a plastic head, Specific Anthropomorphic Mannequin (SAM). The specific absorption rate of this model not only underestimates the absorption rate of radiation for adults, but also that of children.

The report states that  the absorption rate for children is 153 percent higher than the model. The thickness of their skull and absorbency of their bone marrow are stated as reasons for potentially absorbing more radiation. The study advocates for a new certification process that takes into account head size and tissue composition.

Watch Cleveland's local ABC affiliate's report:

According to NIH, a study published earlier this year in the "Journal of the National Cancer Institute" that evaluated children diagnosed with brain cancer between ages 7 and 19 with children without cancer, found no relationship between cellphone use and brain cancer risk.

Earlier this year, the World Health Organization and the International Agency for Cancer Research deemed that the radiofrequency electromagnetic fields associated with cellphone use are "possibly carcinogenic to humans." It estimates current cell phone use at 5 billion users worldwide.

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