Nuclear med can be done as a separate specialty which is 2 years after a 1 year internship. They do cardiac scans, V/Q scans, thyroid uptake scans (and thyroid ablation therapy), bone scans, PET scans, hepatobiliary scans, and a wide assortment of other less common procedures.
Radiology residents get 6 months required of nuclear medicine (although I've heard this is now changed to 4 months required). They are fully qualified to read nuclear medicine studies.
The consequence of this overlap is that many jobs, especially in private practice, are open to radiologists only, since they can contribute more to the practice and nuclear medicine study volume is not high enough to justify a nuc med trained physician. This makes the nucs job market not as good. Many are in academic centers, and I am not sure how high the demand is at these sites. I know at our program the volume of nucs low compared to the rest of radiology (all three are nucs trained, on solely nucs, the others medicine and nucs certified). Also, cardiologist can read the cardiac studies.
