It works great! But, it depends on your phone. I have an Optimus LG D-500. It's not rated well for My phone. It has a slow response on my phone. It only works well around a strong radioactive source, such as Cs-137, Sr-90, Ra-226, Am-241, or my X-Ray tube up close. It depends on the energies and activity of the source. This wouldn't work with C-14, H-3, Po-210, or Pu-239. Test it thoroughly, and use it until you get the best results.
More discrete than having a geiger counter in your everyday carry Yes this isn't an adjusted official tool. But it's better than nothing. As long as you have electricity when SHTF (solar, generator) to charge your phone, you have some sort of a clue what's up when your cellphone starts ticking. LG P880, Cyanogenmod Nightly
This is nothing short of a brilliant idea! It is not a precision measuring device, but it works and you can even check which material they are electron bombing in the rotating anode in your local airport security from the spectral lines.
Didn't work on Nexus 4, no reply to emails I bought the $4+ app, and installed it to a Nexus 4 with the back lens cover covered with 2 pieces of black electrical tape. I borrowed a real geiger counter and some radioactive samples that read about 10-20x above background when very close to the sensor. One was tested even though a thin metal lid with both this app (and nexus 4) as well as the real geiger counter. After following the instructions and allowing the app to calibrate, it settled on a background count around 20 (I tried it several times, and it was roughly 20 each time). The app does mention something about a 60 minute test but no amount of searching would allow me to figure out how to change that time. After calibrating (~20), tried detecting the samples. What would normally take the geiger counter from ~20 cpm to ~500 cpm took this app from 20 up to 26. It is barely statistically significant. Reviewed the website, noting I should have had more than enough sensitivity to detect this. After failing to get useful results, I sent 2 emails to the developer from their site. Their site asks you to email them before you give them a one star rating. After no reply in 2+ wks. (still nothing) I rated.
Interesting idea, but doesn't work well It is very difficult to fully cover the camera. A black electric tape, for example, is not entirely opaque. The "counts" that you see are mostly optical photons that leak through the tape. To check, compare a measurement indoors to a measurement in direct sunlight - you end up getting > 10kcpm rates, easily.
Calibrates best while cool ;-) I tested this app against a nucular densitometer designed for testing the density of road construction. It worked excellent
new menu button, several internal function update. And currently test url for uploading data (will be provided to test users)
new split modus, for better noise handling with low radiations. Help updates new design. Support for the new OS versions. Less permissions needed.
* higher cover lense level for some phones required.
Protecting you from radiation even when you are not expecting radiation!