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E:V:A
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The "REAL RadioactivityCounter" made by scientist Rolf-Dieter Klein, is indeed a very serious competitor. The mere fact that someone has bothered to work out the details how to make a cheap mobile cam, detect ionizing radiation, deserves a PhD by it self.

The difference in using your phone with taped over cam, costing you $5 bucks, is nothing compared to buying a dedicated device in the $100+ range, that is only slightly better for certain types of short-range radiation like (alpha and low-energy beta). In addition the cam CMOS sensors doesn't saturate under high doses, like an ionization based device, and thus provides better accuracy!

The sensitivity depends on the physics of your mobile camera, where most phone cams start picking up radiation at about 10 µSv/h. For the iPad2 it picks up radiation already at the 1 µSv/h level.





So unless you are making high-precision, low-energy or background radiation measurements (like looking for Radon in houses), this app is worth every penny. In addition it is one of the best supported apps out there, with a solid scientific base.

Links:

Hack-A-Day - presentation and review
Developer Web Site
Forum

I especially like the radioactive Bavarian mushrooms YouTube video!
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bamx2
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Would this be sensitive enough to detect leakage outside of x-ray rooms ? Yes, I realize that is is not a substitute for the devices used by licensed radiation safety expert.
 
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Would this be sensitive enough to detect leakage outside of x-ray rooms ? Yes, I realize that is is not a substitute for the devices used by licensed radiation safety expert.
Probably not, since "leakage" measurements involve low level (and possibly also low energy) detection, under a long time.
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It appears the Evo 3D is on their site of devices it works with, so maybe that was just a garbage review after all? It would be nice if there was a trial version for it, I have some Cd-109 and Sr-90 sources I'd like to test it with.

You would think the optics would block nearly all of it, but they say some cameras can still pick up beta particles (Sr-90 specifically). If so this may be useful in finding pitchblende.
 
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It appears the Evo 3D is on their site of devices it works with, so maybe that was just a garbage review after all? It would be nice if there was a trial version for it, I have some Cd-109 and Sr-90 sources I'd like to test it with.

You would think the optics would block nearly all of it, but they say some cameras can still pick up beta particles (Sr-90 specifically). If so this may be useful in finding pitchblende.
Again it depend on the construction and location of the camera module. This is also the reason why they prefer to use the front facing camera for this. It simply contains less lenses and simpler electronics, that can complicate proper measurements. According to the developer, measuring pitchblende is working really well!
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It's somewhat similar to the pulse detector apps for phones... Cool to play with, and lets you say "oh my heart rate is faster after I did my run"... But while it's relatively accurate, you'd want a real monitor for any serious usage... Or take the pulse manually

I guess similar applies here. The dosage depends on the amount of radiation emitted, not how much manages to "light up" the Cmos above background noise...

Again, cool to point at rock which is slightly above background levels, but no something you want to rely on.
Not necessarily... any good heart rate monitoring app works completely perfectly. Maybe you have a bad camera/flash position or the app can't count. It's exactly the same as a pulse ox that they use in hospitals, no reason it'd be any less accurate. If you don't believe me go break into an ER and measure with both

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