You can buy these devices online. GOOGLE them. A couple grand and you can own one for yourselves. Looks like they are used for inspection of welds on pipelines. Congressional spending is a bigger concern.
At least in the United State you need an NRC license to possess one as well as trained personnel to operate it. It isn’t like you can buy one on Amazon and have it delivered to your home.
“You can buy these devices online.”
You need a state or federal license to own one. I was responsible for a smaller source once and the paperwork is considerable. Plus training and inspections, and my source was not portable. Every couple years NRC and the state rad inspector would show up to see if it was still there, not leaking, and only authorized trained people were using it.