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I've never heard of this job, but with a search or two, it sounds kind of like he rappels to points on tall structures to check for structural issues and such using X-rays.
Yep, that's close enough. Although we mostly use a gamma radiation source as x-rays are electronically generated, we aren't near a plug and the equipment is often cumbersome.
There are portable x-ray generators that run off a 20v dewalt battery. But their effective penetrative power means it's only viable for very thin walled pipes.