I do not believe this is true. All the literature I've seen says otherwise. I'd appreciate any evidence to the contrary that is published in an actual peer- reviewed journal that contradicts the below papers...
One paper:
Lead poisoning and the deceptive recovery of the critically endangered California condor
Myra E. Finkelstein, Daniel F. Doak, Daniel George, Joe Burnett, Joseph Brandt, Molly Church, Jesse Grantham, and Donald R. Smith
PNAS July 10, 2012 109 (28) 11449-11454;
https://doi.org/10.1073/pnas.1203141109
A second paper:
Ammunition is the Principal Source of Lead Accumulated by California Condors Re-Introduced to the Wild
MOLLY E. CHURCH, †,$ ROBERTO GWIAZDA, † ROBERT W. RISEBROUGH, ‡ KELLY SORENSON, § C. PAGE CHAMBERLAIN, | SEAN FARRY, ⊥ , @ WILLIAM HEINRICH, ⊥ BRUCE A. RIDEOUT, # AND DONALD R. SMITH* , †
Environ. Sci. Technol. 2006, 40, 6143-6150
I'm pretty familiar with a couple papers with radiographs as you describe. Can you provide any information that indicates which of these it may be and any evidence that it is "fake"?