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- <text id=90TT1375>
- <title>
- May 28, 1990: False Alarms Or No Alarms?
- </title>
- <history>
- TIME--The Weekly Newsmagazine--1990
- May 28, 1990 Emergency!
- </history>
- <article>
- <source>Time Magazine</source>
- <hdr>
- NATION, Page 25
- False Alarms or No Alarms?
- </hdr>
- <body>
- <p> At more than $1 million each, thermal neutron analysis
- systems are designed to spot plastic explosives that can elude
- most other inspections. The FAA has installed TNA machines at
- two airports, New York City's Kennedy and Miami International,
- and plans to require U.S. airlines to purchase 150 of them, at
- a cost of $175 million. But the presidential commission
- contends that the machines are duds: if set to find a small
- bomb like the one that shattered Pan Am Flight 103 (apparently
- between 1 and 2 lbs.), they produce excessive false alarms.
- </p>
- <p> The 12-ft.-long, 6-ft.-high machines generate a cloud of
- neutrons that penetrate the luggage. These combine with the
- nitrogen in plastic explosives to generate gamma rays; an array
- of detectors identifies the substance. But other items
- containing nitrogen, including wool sweaters and padded ski
- boots, can set off warnings. The manufacturer, Science
- Applications International Corp. of San Diego, says the false
- alarms can be reduced with further experience. At the moment,
- says FAA administrator James Busey, "we have no other system
- available."
- </p>
-
- </body>
- </article>
- </text>
-
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