User's Manual

However, very large numbers of animals would be

needed to provide reliable proof of a cancer-promoting

effect, if one exists. Epidemiological studies can provide

data that is directly applicable to human populations, but

ten or more years of follow-up research may be needed

to provide answers about certain health effects, such as

cancer.

This is due to the interval between exposure time to a

cancer-causing agent and the rate for which tumors

develop - if they do. This could take several years into

the future. The interpretation of epidemiological studies

is hampered by difficulties in measuring actual RF

exposure during day-to-day use of wireless phones.

Many factors affect this measurement, such as the angle

at which the phone is held, or which model of phone is

used.

7. What has the FDA done to measure the Radio

Frequency energy coming from wireless

phones?

The Institute of Electrical and Electronic Engineers (IEEE)

is developing a technical standard for measuring the

Radio Frequency (RF) energy exposure from wireless

phones and other wireless handsets with the

participation and leadership of FDA scientists and

engineers. The standard, “Recommended Practice for

Determining the Spatial-Peak Specific Absorption Rate

(SAR) in the Human Body Due to Wireless

Communications Devices: Experimental Techniques”,

sets forth the first consistent test methodology for

measuring the rate at which RF is deposited in the heads

of wireless phone users. The test method uses a

tissue-simulating model of the human head.