Radioactive cancer patients attending this weekend's Super Bowl in Miami could be in for an alarming experience when they pass through radiation detectors designed to signal the presence of dirty bombs. Such cancer patients -- who have received treatment using radioisotopes and still may have tiny amounts of radioactive material in their bodies -- may want to come armed with letters from their doctors explaining their precarious set of circumstances.

The use of radioisotopes in medicine is growing -- and so is the use of radiation detectors in our security-conscious nation, which means patients are triggering alarms when they are not even aware they are being scanned, doctors and security officials say.

Nearly 60,000 people a day in the United States undergo treatment or tests that leave traces of radioactive material in their bodies, according to the Society of Nuclear Medicine. These traces are not enough to hurt anyone, but they are enough to trigger radiation alarms for up to three months.

Radioisotopes are commonly used to diagnose and treat certain cancers and thyroid disorders, to analyze heart function, and to scan bones and lungs. And many doctors already know to equip their patients with travel cards because of the problems they can encounter in public places.

Nearly 20 million nuclear medical procedures were performed in the United States in 2005 -- up 15 percent from 2001. Clearly, the number of people who could be mistaken for terrorists is quite large. So if you are one of these people -- with the power to create a buzz in a public setting -- get your papers in order so you can quickly confirm your identity as nothing more than a cancer patient.

Fifteen years follow up after studying 223 patients with localized prostate cancer showed that radioactive seed implants are a highly effective treatment in combination with conventional external beam radiation.

Seed implants, also called brachytherapy, are small radioactive pellets about the size of a grain of rice. The pellets are implanted into the prostate; they deliver radiation to the prostate cancer from the inside.

Most good-prognosis patients who choose seed implants do not receive other treatments. Patients with more aggressive tumors may get seed implants plus external beam radiation.

Three out of four patients in the study remained disease free at least 15 years after treatment ended. It is not clear from the study if the patients would have fared equally well with either the seed implants or external-bean radiation therapy alone, however they are confident the combined therapy is very effective in treating prostate cancer.

The technique, known as radioembolization or intra-arterial brachytherapy, uses the vascular system to deliver targeted treatment to the tumor. The tiny glass bubbles filled with radioactive material deliver high doses of tumor-killing radiation directly to the liver tumors.

Liver tumors use a supply of blood that is largely separate from the blood that nourishes normal liver tissue, so very few of the bubbles end up in the healthy liver.

The bubbles are smaller than the diameter of a human hair. The outpatient procedure takes about an hour to complete. The bubbles release over 10-14 days.

Patients may be candidates for this procedure if they are not able to get a liver transplant. Mayo Clinic radiation oncologists are now using this procedure.

We have been following the story about a potential cancer cluster that has caused thyroid cancer in teens living within a few miles of each other. The parents have been seeking help and answers to determine if there is an environmental cause. The parent group stated they had approached the state and county and felt they were being ignored in the request to have the water in the area tested. Last week, the city stepped up and offered to investigate.

After the story came out about the Trenton teens, one of the parents said the parent group has been contacted by six other people in the area with thyroid cancer.

In a new development, Cincinnati News 5, who is following this story closely, and investigating information as it becomes available, recently aired an interview with Dr. Peter Rickards of Idaho, who has been investigating other thyroid cancer cases in the Pacific Northwest linked to radioactive fallout from nuclear tests.

According to Dr. Rickards, drinking milk from cows who grazed in dairy fields contaminated with radioactive iodine-131 has been linked to increased cases of thyroid cancer in the Pacific Northwest.

Dr. Rickards suggests the parents and investigators in Trenton look for a fresh source of radioactive iodine in the neighborhood.

Dr. Rickards went on to suggest that they need to take a look at how medical incinerators and cancer clinics have been disposing of iodine-131, perhaps incorrectly, and that might possibly be a source of contamination. He doesn't say this is the definitive cause for the unusual number of young people being diagnosed with thyroid cancer in Butler County -- only that it might be a good place to start looking for answers.

You can watch the Cincinnati News 5 news report video Expert: Contaminated Milk Possibly To Blame For Cancer Cases here.

Compared to cancer rates in England and other parts of Wales, young women under 50 years of age living in the vicinity of the Trawsfynydd nuclear power station in north Wales are diagnosed with breast cancer at a rate 15 times higher than the national averages.

For all other cancers, the rate is double was it is in other communities. The power plant is shut down but the effects from the radioactive waste are still being felt in cancer diagnosis.