Radiology departments in hospitals generally use X-ray CT, which generally uses accelerator-like devices to generate radioactivity without using a radioactive source, so the risk of residuals is relatively small. But pay attention to whether there are supporting equipment such as cables, instrument panels and other activation problems. Another is the use of radioactive sources for medical treatment, such as injection of radioactive substances, this whether there is a residue to pay attention to.
Instruments to measure radioactivity levels are now readily available, and since there are concerns it is advisable to take measurements.