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
Astounding idea Great program, but it will only use the front camera on my devices. No way to change it to the better back cameras.
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
It Works! I have worked in the nuclear energy field for 25 years, with a specialty in radiation protection. I initially laughed at the idea of a smartphone being used to detect and measure radiation. I was wrong! Although this doesn't respond in the same range as your typical "Geiger" counter, it does respond to radiation linearly at levels greater than approximately 2 mrem/hr (100x average background) to 200 mrem/hr. Most people do not have access to rad sources, so many will probably assume that it doesn't work.
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.
* bugfixes for P-02D, Galaxy Note - new camera focus support
* SET NOISE now helps setting noise and background CPM by doing a long time measurement on request after the initial camera measurement
rev 1.5 or older