TSA Admits Bungling of Airport Body-Scanner Radiation Tests
• By David Kravets
• March 15, 2011 |
• 6:10 pm |
• Categories: 'nude' airport body scanners, Surveillance
http://www.wired.com/threatlevel/2011/03/tsa-radiation-test-bungling/
The Transportation Security Administration is re-analyzing the radiation levels
of X-ray body scanners installed in airports nationwide, after testing produced
dramatically higher-than-expected results.
The TSA, which has deployed at least 500 body scanners to at least 78 airports,
said Tuesday the machines meet all safety standards and would remain in
operation despite a “calculation error” in safety studies. The flawed results
showed radiation levels 10 times higher than expected.
At least one flier group, the Association for Airline Passenger Rights, is
urging the government to stop using the $180,000 machines that produce a
virtual-nude image of the body until new tests are concluded in May.
“Airline passengers have enough concerns about flying — including numerous ones
about how TSA conducts its haphazard security screenings — so it is TSA’s
responsibility to ensure passengers are not being exposed to unhealthy amounts
of radiation,” Brandon Macsata, executive director of the group, said in a
statement.
The Electronic Privacy Information Center has been a loud voice opposing the
machines. Last week, it urged a federal appeals court to stop using them until
further health studies were conducted. Marc Rotenberg, EPIC’s executive
director, is expected to tell the same thing to a congressional panel Wednesday.
“The agency should have conducted a public rule-making so that these risks
could have been more carefully assessed,” (.pdf) according to a transcript of
his expected testimony before the House Committee on Oversight and Government
Reform.
Still, the government said the results proved the safety of the devices.
“It would appear that the emissions are 10 times higher. We understand it as a
calculation error,” TSA spokesman Sarah Horowitz said in a telephone interview.
The snafu involves tests conducted on the roughly 250 backscatter X-ray
machines produced by Rapiscan of Los Angeles, which has a contract to deliver
another 250 machines at a cost of about $180,000 each. About 250
millimeter-wave technology machines produced by L-3 Communications of New York
were not part of the bungled results.
Rapiscan technicians in the field are required to test radiation levels 10
times in a row, and divide by 10 to produce an average radiation measurement.
Often, the testers failed to divide results by 10, Horowitz said.
“Certainly, the errors are not acceptable. It’s not every report. We believe
the technology is safe,” she said. ”We’ve done extensive, independent testing.
It doesn’t raise alarms in terms of safety.”
Rapiscan, in a letter to the TSA, admitted the mistake and is “redesigning the
form” used by its “field service engineers” when surveying the Rapiscan Secure
1000 that is deployed to 38 airports.
“Oftentimes, the FSE will bypass the step of dividing by 10. While the
resulting entry, at a pragmatic level, is understandable on its face and usable
for monitoring purposes, the value, if read literally by persons unfamiliar
with our system and the survey process, would imply energy outputs that are
unachievable by the Secure 1000 Single Pose,” (.pdf) Rapiscan wrote.
A recent Wired.com three-part series examined the constitutionality,
effectiveness and health concerns of the scanners, which the TSA mandated as
the preferred airport screening method in February 2009. Among other things,
the Wired.com series concluded that there was discord among the scientific
community about the scanners’ health risks to humans, and that they were not
tested with mice or other biological samples before being deployed.
The government, however, maintains a thousand screenings equal the amount of
radiation of one standard medical chest X-ray.
A federal appeals court hearing EPIC’s lawsuit suggested last week it was not
likely to halt the scanners’ use.
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