"portable nuclear device" in Pennsylvania turns out to be soil compaction tester
(mobile.twitter.com)
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The use of these devices is so over regulated it makes doing the job a real pain in the rear. They have a small amount of radioactive isotope that penetrates the soil and gives a reading-in a controlled manner.
https://mobile.twitter.com/doodlebugeye/status/1515683936617312262
Here's what the guy was responding to