I hate to put a crimp in the story, but anytime you're complaining about the negative effects of something that happened 50 years ago, those effects by definition couldn't have been too great.
(Or you wouldn't still be alive.)
My father-in-law worked at Oak Ridge in the middle 50's and died of a rare form of cancer in 1994. Richard Feynman died of the same rare form of cancer in 1988. Maybe it's just a coincidence.
Most cancers take decades to develop. I can't find a national organization of Pediatric Oncologists. The closest I could find is the American Academy of Pediatrics (AAP) and the American Society of Clinical Oncology (ASCO).