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| January 7, 2010 | US tightens airport security with whole body scanners | | Washington: The Transportation Security Administration (TSA) in the US is stepping up its security procedures with the deployment of whole body scanners at the country's airports following the foiled attempt by a Nigerian to blow up an airline on Christmas Day. To date, TSA has deployed two types of scanning systems:
Millimeter wave technology uses low-level radio waves in the millimeter wave spectrum.
Two rotating antennae cover the passenger from head to toe with low-level RF energy.
Backscatter technology uses extremely weak X-rays delivering less than 10 microRem
of radiation per scan - the radiation equivalent one receives inside an aircraft
flying for two minutes at 30,000 feet. An airline passenger flying cross-country
is exposed to more radiation from the flight than from screening by one of these
devices. The National Council on Radiation Protection and Measurement (NCRP) has
reported that a traveler would need to experience 2,500 backscatter scans per
year to reach what they classify as a Negligible Individual Dose. The American
College of Radiology (ACR) agrees with this conclusion. The ACR is not aware of
any evidence that either of the scanning technologies that the TSA is considering
would present significant biological effects for passengers screened. | |
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