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I have this[1] Android app on my phone and try it out once in a while, it didn't pick up anything so far, which is probably good news. But I do wonder sometimes if it does actually work, i.e. it really would detect if something was there.

https://play.google.com/store/apps/details?id=com.ImageInsig...

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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)

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