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and brain tumors ever undertaken. WHO summarized its

conclusions concerning Interphone as follows: "Overall, no

increase in risk of glioma or meningioma was observed with use

of mobile phones. There were suggestions of an increased risk

of glioma at the highest exposure levels, but biases and error

prevent a causal interpretation. The possible effects of long-

term heavy use of mobile phones require further investigation."

The WHO's comments on Interphone are available at: http://

www.iarc.fr/en/media-centre/pr/2010/pdfs/pr200_E.pdf.

WHO's publication of Interphone is available at http://www.

oxfordjournals.org/our_ journals/ije/press_releases/freepdf/

dyq079.pdf; see also, Interphone Appendix 1 (http://ije.

oxfordjournals.org/cgi/data/dyq079/DC1/1), and Appendix 2

(http://ije.oxfordjournals.org/cgi/data/dyq079/DC1/2).

What Does Specific Absorption Rate (SAR) Mean?

In 1996, the FCC, working with the FDA, the U.S. Environmental

Protection Agency (EPA) and other agencies, established RF

exposure safety guidelines for wireless devices in the United

States. Before a wireless device model is available for sale to

the public, it must be tested by the manufacturer and certified

to the FCC that it does not exceed limits established by the FCC.

One of these limits is expressed as a Specific Absorption

Rate, or "SAR." SAR is a measure of the rate of absorption of

RF energy in the body. Tests for SAR are conducted with the

wireless device transmitting at its highest power level in all

tested frequency bands. Since 1996, the FCC has required that

the SAR of handheld wireless devices not exceed 1.6 watts per

kilogram, averaged over one gram of tissue. Although the SAR is

determined at the highest power level, the actual SAR value of

a wireless device while operating can be less than the reported

SAR value.

This is because the SAR value may vary from call to call,

depending on factors such as proximity to a cell site, the

proximity of the wireless device to the body while in use, and

the use of hands-free devices.

For more information about SARs, see the FCC's OET Bulletins

56 and 65 at www.fcc.gov/Bureaus/Engineering_Technology/

Documents/bulletins, www.fcc.gov/oet/ea. You may also wish

to contact the manufacturer of your wireless device.

Can I Minimize My RF Exposure While Using My Phone

or Device?

If you are concerned about RF, there are several simple steps

you can take to minimize your RF exposure. You can, of course,

reduce your talk time. You can place more distance between

your body and the source of the RF, as the exposure level drops

off dramatically with distance. The FDA/FCC website states

that "hands-free kits can be used with wireless devices for

convenience and comfort. These systems reduce absorption

of RF energy in the head because the phone, which is a source

of the RF emissions, will not be placed against the head. On

the other hand, if the phone is mounted against the waist or

other part of the body during use, then that part of the body

will absorb more RF energy. Wireless phones marketed in the

U.S. are required to meet safety requirements regardless of

whether they are used against the head or against the body.

Either configuration should result in compliance with the safety

limit."

Also, if you use your wireless device while in a car, you can

use a wireless device with an antenna on the outside of the

vehicle. You should also read and follow your wireless device

manufacturer's instructions for the safe operation of your

wireless device.