Sure, totally believable. /s
I have a bunch of smoke detectors piled up - I can’t just throw them away, I’m supposed to take them to the “Haz Waste Day” - but of course every year I forget. (With a big pile of flurescent tubes sitting nearby). I hope I don’t get a SWAT team at my door.
I was at a site that did testing of radiation detection systems. I kept seeing a guy get into his own car with a DIXIE cup and drive around, then go back into the building, and repeat all day long.
I finally had to ask what he was up to. (He’s got the Dixie cup on the dash of this Honda Civic, street clothes, etc.)
“Oh - I’m just calibrating the detection levels of the radiation sensors.”
Obviously those sensors can detect a VERY low dose.