This patient support community is for questions related to juvenile diabetes including celiac disease, depression, diabetic complications, hyperglycemia / diabetic keto-acidosis, hypoglycemia, islet cell transplantation, nutritional issues, parenting a diabetic child, pregnancy, pump therapy, school issues, and teens with diabetes.
http://www.nlm.nih.gov/medlineplus/ency/article/003846.htm
I'm not a physician, but from what I've read, the fluorescein doesn't seem to be radioactive. It is a dye used to allow an ophthalmologist to see our retinas and the blood vessels and any leaks better.
Do you know someone who had the radioactive radiography? Perhaps that person can help you track down info from the facility where they had the procedure done? Maybe others on this board will have more info, too.
Wish I could be more help; hope you find the info you're looking for.
It's always helpful to hear from other people's experiences.
Take care