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However, it is not sufficient to measurably increase body temperature, and there are no other clearly established effects on the body from radiofrequency energy.It has been suggested that radiofrequency energy might affect glucose metabolism, but two small studies that examined brain glucose metabolism after use of a cell phone showed inconsistent results.Electromagnetic radiation is defined according to its wavelength and frequency, which is the number of cycles of a wave that pass a reference point per second.

The National Toxicology Program (NTP), a federal interagency program headquartered at the National Institute of Environmental Health Sciences (NIEHS), which is part of the National Institutes of Health (NIH), recently completed a series of large-scale studies in rodents of exposure to radiofrequency energy (the type used in cell phones).

This investigation was conducted in highly specialized labs that can specify and control sources of radiation and measure their effects.

The dose of the absorbed energy is estimated using a measure called the specific absorption rate (SAR), which is expressed in watts per kilogram of body weight.

Exposure to ionizing radiation, such as from x-rays, is known to increase the risk of cancer.

Its only consistently observed biological effect in humans is tissue heating.

In animal studies, it has not been found to cause cancer or to enhance the cancer-causing effects of known chemical carcinogens (6–8).

Electromagnetic fields in the radiofrequency range are used for telecommunications applications, including cell phones, televisions, and radio transmissions.

The human body absorbs energy from devices that emit radiofrequency electromagnetic radiation.

The energy of electromagnetic radiation is determined by its frequency; ionizing radiation is high frequency, and therefore high energy, whereas non-ionizing radiation is low frequency, and therefore low energy.

The NCI fact sheet Electromagnetic Fields and Cancer lists sources of radiofrequency energy.

There are three main reasons why people are concerned that cell phones (also known as “mobile” or “wireless” telephones) might have the potential to cause certain types of cancer or other health problems: Radiofrequency energy is a form of electromagnetic radiation.

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