You may not even get x-rayed down here it is a lottery system. You push a button if it turns the light green then away you go. If it turns red...well then it is inspection time.
My co-worker that has spent time there told me about the red light green light thing. They also told me to give as little of information as possible when going thru customs.
As far as the x rays, I was more concerned about the TSA zealots here inspecting my luggage.