The World Nuclear Association (which represents the "global nuclear profession") has a radiation guide but CardioGen-82 isn't mentioned. It's not something you can figure out yourself. Of course we are exposed to radiation all the time, including when we receive medical treatment. And we know that exposure to large doses of radiation (think Chernobyl) can have catastrophic effects, but experts say these three patients likely did not absorb enough radiation from CardioGen to harm them. However, it was in their bodies longer than it should have been, said Enrique Urrutia, a professor of radiology and nuclear medicine at the University of South Florida.
After the first two patients were tested at Oak Ridge National Laboratory for strontium levels—a radionuclide that can harm bone marrow—the FDA found "no objectionable conditions" in its visit to Heart Specialists of Sarasota and that "the risk of harm from this exposure is minimal, although any unnecessary exposure to radiation is undesirable." Still, the agency did ask Bracco Diagnostics, the manufacturer, to recall its device.
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According to a report by the Florida Bureau of Radiation Control, the FDA is investigating a possible manufacturing problem that led to a shortage of the CardioGen-82, beginning in January. So far the FDA has not commented on its investigation.