Medical News That Matters
Travelers’ Alert: Are You Radioactive?


Radioactive isotope tests can set off security detectors.

By Dr. Isadore Rosenfeld Published: October 1, 2006

Terror threats and attacks have had a profound effect on our everyday lives. The recent arrests in England involving a plot to bring potentially explosive liquids on board aircraft have led to tighter airport security screening than ever before. (One of my patients —who thinks he’s funny—c hides me by saying he gets a better physical prior to boarding a plane than he does in my office!)

We know to leave behind most sharp metal objects and any other item that conceivably might be used as a weapon. However, you may not be aware that after undergoing certain diagnostic tests, you can activate airport screening triggers.

Recently, a man repeatedly set off the security alarms at a U.S. airport. When the usual wands and patting down failed to reveal the source of the trouble, he was detained, sniffed by dogs and strip-searched. He finally was released when he thought to disclose the fact that, a few weeks earlier, he had been treated with radioactive iodine for his overactive thyroid gland.
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There are several radioactive isotope tests and treatments that can trigger detectors at airports and federal buildings. The residual isotope can last as long as 95 days after the procedure. The more common ones are radioactive iodine to diagnose or treat thyroid disease; radionuclide cardiac stress tests; certain lung, heart and bone scans; and radioactive seeds implanted to treat prostate cancer and, less commonly, breast cancer.

If you have undergone a diagnostic procedure, always ask your doctor whether any radioactive material was used. If so, and you are scheduled to fly within the next few months, get a letter indicating the date and nature of the test and show it to the security personnel at the airport. It could save you lots of time and trouble.