Radioactivity Counter

The Radioactivity Counter is now available for 3,49 € for Android owners. The application is designed for use in English language. It weighs in at only 10MB to download. The new Radioactivity Counter app version 1.7 has been updated on 2014-11-18. The Apple Store includes a very useful feature that will check if your device and iOS version are both compatible with the app. Most iPhone and iPad are compatible. Here is the app`s compatibility information: 2.2 and up
Bottom Line: For more information about Radioactivity Counter check developer Rolf-Dieter Klein`s website : http://www.hotray-info.de

app works I get a linear dose response from various CS 137 sources however it is glitchy and sometimes freezes or dies when switching from front to back camera please update software functionality                 Daryl Fahner

I have Samsung Galaxy Note 9 and I needs to be a way to change it to the rear camera because the front camera keeps picking up light from the screen for example in the notification tab gets pulled down I ve tried everything for foil duct tape foil and duct tape Electrical tape as well but everything still lets light in             Cory Cunningham

It always tells me canmot obtain the camera please fix     Mahmoud Elselimy

Did not work or at least very poorly on OnePlus 6T I used a 100 kBq 3 uCi 241Am source directly against Al foil covered lens without any noticable increase in count rate             Richard Andersson

Compares well against Professional Geiger Counter Great for the minmal cost                     A Google user

so i had a high school team test this against some of the cheaper commercial detectors and this actually held its own so for the price i say it is well worth it                     Robert Hayes

Not working on S9     Stefan Smith

Good for logging Shame no conversion to sieverts or rads             Dominic Kent

Not much of a discrepancy                     Ravi Indran S R

I Love It Rolf is a genius I ve wanted a working rad counter since I was a boy Definitely responds to an old radium dial watch My Galaxy Tab A 9 7 SM T550 Android 6 0 1 tablet is not on the calibration list maybe it will be added someday It does not work on my Oreo smartphone                     Mike Waters

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 backround 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 materiel 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 interfernce 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                     cwtch mahboner

Have tested and seems to work well My proposed additions mods Making it able to talk to a photomultiplier tube Can be done with appropriate changes Putting spectrum plot on a separate full size screen Could it work with a scintillator with appropriate attachments To see only Xrays etc                     Arne

Works fine Not sure about accuracy but tested in an airport x ray machine which caused a CPM spike as expected                     Alexander Ivanchev

I ve been enjoying this app for a few years now It s fun to keep an eye on the science around me and it s sometimes useful as well as fun                     Michael Fraughton

excellent innovation                     MAX TAM

I compared the readings from this app to my GMC 300E geiger counter and the readings were accurate within a margin of error 003 given a top end cpm count of 2000 or 50 mR h I duplicated these results 12 times over 3 hours I took the advice of other users and placed 2 black duck tape strips over the camera so only gamma rays could penetrate to affect the sensors This is very accurate and I would absolutely recommend this product                     Kevin Sullivan

This is nice I served in the US Army on my NBC team and I can verify that this works I tested this with my smoke detector and some fly ash and it it worked similarly to the radiation detectors I used in the army BTW My phone is a ZTE Warp 7 and I use the rear camera with some foil sandwiched between two pieces of electrical tape mounted under my protective case for my phone                     Kevin Pierce

Not a novelty Not sure on accuracy or sensitivity but it worked a treat My wife had treatment where she took radioactive iodine for a thyroid condition and the count showed at least 20 times the amount of back ground radiation near her throat as expected I placed a small layer of aluminium foil held over the lens by tape Make sure no light gets in i e test background count with and without a light shining on it                     Craig Halligan

Good app I test it with x Ray Gama and is working I will like to have the option to run in the background and to run with the screen off That will keep down the temperature of the screen and save battery I wpuld like to kept ithe app runing in background and check it by the end of my day                 Calin Vasile

This app works Some people complain about the front camera being used for the app but this can be changed by going into the settings and turning the frontcam off Hit menu to get to the settings                     Allan Bekkala

This APP fails Nuclear Medicine degree here so I do have that I installed this App on 2x phones LG S3 and Samsung S8 Active Nether device will pick up ANY radiation I have a Fiestaware cup Uranium I know it s real because I tested it in front of a real geiger counter and a gamma ray spectrometer I think I know what I m talking about here u003eu003eu003e This APP is a FRAUD The fact I HAVE TO pick a single STAR is WAY TOO MUCH CREDIT for you guys Straight up App FRAUD How many of you people ACTUALLY tested it on something radioactive Not exactly something you can just do at Lowes     A Google user

I was not expecting the accuracy to be as good but it closely compares to the readings from my GMC 320v4                     Surprising Henry Smith

Surprisingly accurate when compared to a dedicated geiger counter Excellent idea and very well executed                     Elegant and Powerful Arthur Davis

Works on my phone Detected coal ash radiation using black electrical tape as covering                     Works on my phone Detected coal ash radiation George Watson

Can I get a refund How do you stop light from traveling down the screen and into the camera On Samsung S6     Harold McDermott

top notch particle detector                     Marshall Bromwell

That s amazing                     A Google user

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 u0026gt 10kcpm rates easily         Interesting idea but doesn t work well areg danagoulian

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                     It works great But it depends on your phone Kyle Wilson

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                 More discrete than having a geiger counter in your everyday carry A Google user

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                     It Works Michael Stuart

Really neat idea to use the on board CCD chip to detect ionized particles That along with other apps that utilize on board sensors makes my phone feel like a tricorder from star trek D 11 10                     Impressive Fox G

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     Didn t work on Nexus 4 no reply to emails Bret Walters

Great program but it will only use the front camera on my devices No way to change it to the better back cameras                     Astounding idea David Margolis

I need adwice i am sick i was ex pose with a a mo ile it scoop up to 50000 cpm and it has i feel unwell what to do     Gert Lied