Radioactivity Counter

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.

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.

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.

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. :-)

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 - - - >>> 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.

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..

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.

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.

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

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

That's amazing

The graph labeling is so small that it is unreadable. The radiation levels required are quite high before this app will show anything.

use alloy foil piece below black tape to cover, and test with a flashlight. VERBESSERUNG: bitte Tabellen der Telefon-Kalibrierungen einpflegen (Analog der Umrechnungstabellen) sodass man unabhängig von der Homepage die Werte einpflegen kann. Erstaunliche App

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

Surprisingly accurate when compared to a dedicated geiger counter. Excellent idea and very well executed.

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.

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

I tried it on my lg g3 on a smome alarm and it didnt read 2 cpm, it read nothing. Is it my phone or the app

Cant switch cameras

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.

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

Great program, but it will only use the front camera on my devices. No way to change it to the better back cameras.

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.

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.

Rad protection tech, checked app with a known source, no reading.

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?

The rooms, flats, and buildings, are radioactive! Therfore are so many cases of cancer. The building materials are radioctive.This app can save you!!

Works well if you follow the instructions! Great concept and follow thru. Amazing app!

It actually works!

Love it

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.

I tested this app against a nucular densitometer designed for testing the density of road construction. It worked excellent

Cant switch cameras

My wife was receiving experimental radiation therapy(PRRT) art Excel Diagnostics in Houston Texas. I checked it against the radiologist equipment and it works ! Accuracy seems pretty good depending on user and phone model. A bit confusing to calibrate and interpret readings for the the lay person. But, it works ! This app is hot (and so's my wife) . SGII

Tc99 HIDA CCK was done on a friend, after 12 hr (6 hr half life) Samsung Epic II was still picking up 950+ CPM. This app rocks, thank you for it.

I am in Tokyo and we are always a bit concerned about radiation these days - as you can imagine. I found this app to agree with a private-owned online geiger counter found here. Seems to be accurate to within 10%. Very impressive

It detect radioactive source...Great!

I am a nuclear medicine tech and when I found this my computer workers and I just had to try it. I taped the lens and put it in front of a dose of tc99m and sure enough it works! I think I have some calibrating to do but it definitely detects radiation. It needs the traditional gm beep though so it sounds more official.

Why it does not work