very safe

for centuries it has been used to treat wound by direct application.So , usage for radio-graphic procedure is definitively safe

I do not use it orally. Topically, with heat, has a long history of use to modulate the immune and inflammatory response post-procedure and injury. I use it clinically following gynecologic and obstetric procedures to reduce pain medication use (and side effects) with good results, and without ill effects.

Castor oil causes increses gut motility and use as laxative effective befor KUB . It has no side effects on surgical site .

Though castor oil doesn’t have any adverse effects for radiological imaging as it has been used for decades, topically for wounds. We don’t have much evidence based studies to prove it otherwise.