Short answer to the title question: yes.
They are both species of ionizing photons, and you use the same set of mechanism to detect either band. Typically hodoscopes (perhaps based on fiber and high gain photo-diodes), multi-channel plates, or silicon strip detectors.
That said, I suspect that anna is right when she says that the machines used to scan luggage at the airport are not designed, or tuned to detect low levels of radioactivity (say kBq) in the baggage. The geometry that is most favorable for fast planar scanning will not be good at imaging a point source, and the designed flux is probably pretty high, meaning that weak sources only tweak the results by a little bit.
I have seen colloquia from people involved in designing large scale scanning machines for (shipping containers), and they but a great deal of thought and effort into the matter. Hand luggage is surely easier, but still non-trivial.