Using CMOS Sensors in a Cellphone for Gamma Detection and Classification

From what I've read it works well enough, but it's not terribly useful to most folk - given you're probably holding it in your hand while checking for radiation, if the camera is exposed, then so are you. Mostly useful as a "oh crap, I've been exposed to this much radiation???" dosimeter.

Maybe invest in a selfie stick if you plan on going anywhere "hot" with only your phone, so at least you can peek it around corners. But Geiger counter are not that expensive - I picked up a GQ GMC-300E-PLUS for about $125 AUD a while back, which also detects beta radiation and has nice data logging capability, easy to use readouts, etc.

(The 300E Plus is perhaps not a good example since it doesn't have a probe equivalent to the selfie stick idea, but comparing it to hand-holding the phone it is superior + I'm sure you could lash it to a stick if you really needed to)

The CMOS sensors have gotten much bigger (4-6x area plus there's multiple cameras) and the amplifiers are now almost thermal noise limited... but there's so much AI between you and the image that without using RAW it would be stomped out.

I'm not sure how well the phone cameras would deal with cooling... since you don't really need the mechanical AF or zoom to work. That would be the next step, if you deconstructed them.