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Travelers may now face a new security problem. They could set off radiation detectors meant to detect smuggled nuclear-bomb material but that also sense the small amounts of radioactive elements used in exercise stress tests and other increasingly common medical procedures.
The numbers explain the situation:
* There are now some 10,000 portable radiation detectors deployed throughout the U.S. at metropolitan transit stations and at border crossings and other points of entry. They may also be set up at sporting events, political rallies, and the like. They are not used at airport checkpoints, but may be at other airport locations.
* More than 16 million patients now undergo a medical test or treatment that involves the use of a radioactive element such as thallium or an iodine isotope.
* Detectable levels of some elements can remain in the body for as long as three months (see the table below).
The use of radiation detectors has been on the increase since Sept. 11, 2001. The number of people undergoing nuclear-medicine procedures has also been growing, increasing the likelihood of tripping a detector. To date, though, there are no figures for the number of people who may have been stopped by these detectors.
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