Radioactivity Counter

★★★★★ This app is great it really works I've tested it against a Geiger Counter the readings were accurate to love it!!!

★★★★★ Works on my phone. Detected coal ash radiation. Works on my phone. Detected coal ash radiation using black electrical tape as covering.

★★★★★ I have a galaxy s3 the app seems to work rather well, I wish there was an inbuilt scale that can be brought up when requested that could show what a safe dose is compared to the readings that you have got. In terms of safety this is a good idea because if you have a known comparison of what is safe to compare to your own readings, it may stop someone from being exposed to not safe levels. As it is, I have seen 40-60 cpm and have no idea if this is normal, or not normal background radiation, I wish there was something in the app I could compare the results too so I would have a better idea of the strength of source material. (40-60 cpm were found on a rainwater runoff leading to a drain), with Fukushima now becoming a problem in the Northern Hemisphere, a comparison chart of safe and unsafe levels is a must on the phone. *****ATTENTION***** I have discovered there is governmental interference on this app, they are adjusting the sensitivities and denying you a full truthful count, will you please use your own scientific results to create a bombproof version that cannot be adjusted, and gives results based on research for each device. This is too important to let go of, thank you.

★★☆☆☆ 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.