THYROID TREATMENTS TRIP ALARMS, STUDY FINDS

"Radioactive medical procedures can set off alarms in a post-9/11 world"
By Liz Szabo, USA TODAY

Most seasoned travelers know that their watches and belt buckles can set off airport metal detectors. A new study also shows that patients who have certain medical procedures might themselves set off security sensors designed to find "dirty" bombs or other radioactive weapons.

Patients may emit small amounts of radiation after being treated with radioactive iodine, for example, or after being injected with compounds used in PET scans, bone scans and cardiac stress tests, says Lionel Zuckier, a radiology professor at New Jersey Medical School.

Patients have been treated with "radiopharmaceuticals" for years, and 16 million nuclear medicine procedures are performed each year, according to the Society of Nuclear Medicine. Since 2001, however, doctors say they're hearing about more patients setting off portable radiation detectors used in subways, tunnels and other public places, says Zuckier, who presented his findings Tuesday at the annual meeting of the Radiological Society of North America in Chicago.

Patients injected with a material called FDG before having a PET scan stop emitting a detectable level of radiation within 24 hours. But patients undergoing iodine therapy for thyroid conditions emit radiation for 95 days.

Many doctors say they now provide patients with detailed explanations of their treatments, along with telephone and pager numbers, just in case patients are stopped by security. Chaitanya Divgi, a nuclear medicine specialist at New York's Memorial Sloan-Kettering Cancer Center, says security officers have called about his patients 15 to 20 times since 2001.

One elderly couple in a Winnebago were detained last year at a bridge at the Canadian border while trying to return to Michigan from a camping trip. The man recently had been treated with iodine-131 for his thyroid, says Michele Beauvais, director of nuclear pharmacy at William Beaumont Hospital in Royal Oaks, Mich., where the man was treated. The patient showed border guards a card explaining his treatment.

"The guards said, 'Well, you can go, but we have to keep the Winnebago,' " Beauvais says. "It kept setting off the sensors." Guards eventually realized the suspicious signals were coming from the contents of the Winnebago's toilet. "None of the people at the bridge wanted to empty it," Beauvais says, "so they eventually let him go."

...hmmm... I should have an interesting time getting through Orange County and Sacramento Airports on December 10th when I fly home!