The problem with regular Geiger counters is that the sensitive ones saturate and you risk missing being in a high radiation environment. The models built for civil protection are not sensitive enough for daily use.<p>Luckily scintillation counters, like the one from the article seems to be, became really cheap in the past few years. I have a RadiaCode and it is a device one could only dream of a decade ago.
>The device can be used by industrial and medical radiation users, regulatory authorities, the nuclear energy industry, first responders and military users<p>It cannot be used by TSA employees. They are not allowed to even wear dosimeters.
Tangentially related: If you haven’t already, I‘d suggest to look at Radon. It‘s the #2 reason for lung cancer, and is very easy to measure and mitigate (automatic ventilation). Many countries have Radon hazard maps.
Kinda neat that they were able to marry all those different scintillators together in one package, but their paper makes it sound like you're still going to want an He3 tube along if you really care about finding neutrons.