I was at a site where the guys was testing a similar device out. I wasn’t exactly sure what he was doing though. he would get in his own car and drive through, and go back into his lab. Come back out, do it again. After one time I went over to ask him what he was doing. He said he was doing tests on the various small levels of radiation that the ting could pick up.
He raised the Dixie cup of liquid that had been sitting on his dash (bare hands, street clothes, own car recall)! I was amazed that the machine could detect such small levels (my assumption!) of radiation.
A far cry from the handheld radiation geiger counters