The article states that this unit came from LLNL. There was a unit at Fernald that was identical there must be a few of these in the DOE system.
Radiography unit at SRS verifies contents of TRU shipments to WIPP
https://www.ans.org/news/article-3673/srs-xray-unit-verifies-contents-of-tru-shipments-to-wipp/