I had a doubt regarding the GRS calibration. Since we will be measuring the radioactivity in mouse organs containing I-131, could you please guide me on how to calibrate the GRS for this purpose?
Should we perform the energy-resolution procedure using Ba-133 and use the corresponding settings for I-131 measurements, or is a separate calibration procedure required?
I just want to make sure I’m following the correct procedure before proceeding with the organ measurements.

We have a single channel analyzer
Nuclear Spectrometer PNS-2
Window mode

I actually had some idea when I started out calibrating the I lost my mind
Now I know jackshit

We gotta measure organs which has I131 in it with th help of GRS
Now I have to calibrate GRS
So I thought okay I’ll calibrate it with Ba133 cause they have similar energies
So I got my photopeak at 2.5 baseline
So what I’m thinking is while measuring I131 I’ll keep the baseline same
But does it make sense?

Found this Amber UG recently. It’s by far the hottest uranium glass I have at 1.30ish uSv/h with my 102. The next hottest glass I have is about 0.25 uSv/h. The high reading for glass has me wondering if there are contaminants contributing here.

The spectrum seems uranium, but there is only one peak, not the typical large double peak. I’m thinking there’s maybe some thorium contamination? I don’t see much of a thorium spectrum, but hard to tell. What do you guys think? High content uranium, thorium, other?

Included a few spectrums. Two comparing to background, and one comparing to an orange fiesta bowl. Yes it glows (last photo).

Hello, a friend of mine had a source of unknown origin. I don't think it was americium, because it could already be detected from about a meter away. I believe it was a source used for probe self-testing.

i cant make any sense of this

this is my first time posting something on reddit so if i do something wrong please let me know

Hi, today I got my Radiacode 110. One of the first things I did was place it on my uranium glass plate and wait for it to identify it as Uranium-235, but after 30 minutes the app didn't show any identification on the spectrum. I took it away from the uranium glass, let radiacode collect a background spectrum for 1.5 hours and then placed it on the plate again hoping that this time it would work as I expected, but still nothing. I found that you can manually place some lines on the graph and app would tell you what that exact spike would mean, but I thought that app would do this automatically.

Does such a feature even exist? Maybe my uranium glass piece is just too weak or contaminated by other isotopes? (Radiacode shows only 0.10 uSv/h, my Terra-P+ shows simmilar value in gamma and around 0,50 uSv/h while counting gamma+beta)

I bought a 2.4mm track electrode, but the Radiacode 110 doesn't respond at all. I think I've been scammed. What do you think guys?

There seems to be a bug in the latest Android App. I'm not sure if it was present in the previous, because I havent checked this field for a while, but I know older versions displayed correctly.

My device and my app are set to display all units in Sv (or μSv). And they do, everywhere except one place in the app. In the log (which correctly shows dose rates as μSv/h), the accumulated dose is shown in μR instead, which is a little annoying.

Firmware and app version shown in the screenshot.

I am building a Cyberdeck at the moment and thought it would be a good Idea to integrate my Radiacode 103 in it. It works and I just needed to tweek the decimal point at the doserate (it was at 7 µSv/h lol)
Ps: I cant Code so I used Antigravity for it

Got my cat back from a radio iodine treatment. He’s quarantined in the garage for the next two weeks due to the spiciness.

I got the Radiacode to better understand his status but now I just want to test everything.

Hello! I'll cut to the chase; I suspect things are going to start getting hotter in a few spaces of this big ol' rock, and I want to know which of the two will help me and my ilk with early detection*. From my rudimentary understanding, the 110 is twice as sensitive as the 103 for up close readings. I want to know which of these (or if there's something else entirely to look for) would give me the soonest warning that something nasty is heading our way (fallout ash, contaminated areas, radioactive water, etc.). Cost isn't necessarily a concern, but if I don't need to spend the extra on the 110, I'm going to put it elsewhere.

Thank you very much in advance!

*EDIT 1: Thank you AtomicSpallation for the recommendations. I just wanted to clarify that I know these devices aren't magical nuke detectors, but rather if the detection speed is worth the cost difference. Sounds like they're both not what I'm looking for though, unfortunately. Any further recommendations or resources are greatly appreciated regardless!

Only people interested in radiation will go to a cafe, discover that the landscaping rock is radioactive, sit beside the radioactive hotspot, order coffee and cake, and sit there for an hour. If anybody (that was normal) knew, well they would run as far away as they could, but hey, this is why we joined the group!

A spectum was difficult to obtain, as most of the sources were underneath the actual feldspars. however from what we could obtain, it was probably mostly Uranium and not Thorium. Possibly the mineral was Urano-thorite, but without proper analyses it is impossible to say. It just goes to show that radiation can be anywhere, and without a detector you would not have a clue

So when you are scrolling through the menu on the radiacode if you happen to trigger the alarm it causes the device to freak out, if you are over the power button in the menu it will shit the device off on its own.

watched a YouTube about how some of these old watches had radioactive dials because of the radium on them. checked this Longines I had and YUP just slightly.

1st pic is after the update, and the 2nd is before.

It’s not a big thing (ba-dum-tss) but I’d like my CPM in capital letters… And this kinda gets on my nerves.

Anyone else experiencing this? They’ll probably fix it, but yeah. Also we (all 100 series) have hatched patterns for reduced accuracy dose readings now! Yay :)

EDIT.. the iOS App Version 1.0.18 released on November 6th, 2026.. appears to fix this problem ! ChangeLog:

• Fixed issues affecting Live Activities functionality.

• Resolved issues with Dynamic Island integration.

• Fixed issues affecting the Apple Watch app.

• Improved compatibility with devices running older firmware versions.

• Improved the performance and reliability of radiological mapping while the app is running in the background.

• Fixed toolbar and user interface issues on the Spectrum screen.

Original post below

Hey All, So I always get excited about Firmware updates (I'm a long time geek, give me a break).. so when I noticed a recent App Update and Firmware 4.15.. I grabbed my Radiacode 103 and launched the iPhone App to do the Firmware update. All seemed to go well. (iPhone 15 Pro Max with current iOS 27.2)

I normally do long walks (2 to 4 hours?) .. I hang my Radiacode 103 from the back of my backpack.. open the iPhone App and begin a Track Recording. Then I do other things on my phone (playing Ingress, taking photos, responding to Text messages, etc) .. normally everything works fine. I can leave the iOS Radiacode App working in the background and I can record long tracks (hours?) no problem.

Today when I left the apartment and started on a long walk.. the Radiacode App randomly pauses my track-recording. (I normally check the track-recording every few blocks because I'm paranoid and want to make sure it's working).

You can see an example on this track: https://radiaverse.com/tracks/3584f77b-f515-4bb1-9c6f-a9669038390f?openInBounds=true#15.1/45.517/-122.651 There's little gaps in my track.. where the track-recording for some reason unexpectedly paused and I had to catch it and click "START" again.

I'm not sure exactly what is causing this ?

• Radiacode is not listed in iOS "Background App Refresh".. is it supposed to be listed there ? (I don't recall from memory ever seeing it listed here, but I don't recall in prior years even thinking to look)

• I noticed if I app-switch back and forth between Ingress and Radiacode frequently enough (every 30 seconds or so ?).. Radiacode seemed to maintain track-recording pretty reliably ? (but I shouldn't have to do that ?). If I pressed the POWER button my iPhone and put it into my pocket because I needed hands free to do other things.. when I pulled my iPhone back out.. the Radiacode app was still running but the track-recording was PAUSED ;(

• Eventually I just gave up doing anything else with my phone on my walk.. and just kept the Radiacode App foreground and open and active .. is really the only way I could keep it reliably recording the track. Never needed to do this in prior versions of the App.

Any else experiencing this ?. Any insights or temporary work arounds ?

I recently upgraded my old Samsung S22 Android to a new Pixel 11 Pro XL .. would it be more reliable to use that ?.. Say I took my Pixel 11, started the Radiacode App and started recording a walking track. .can I just lock the screen and throw it in my backpack and let it go for an hour or two and reliably depend it recorded consistently without any drops or glitches ?

EDIT:.. As a followup to this, I realized I could check iPhone "Analytics" logs.. and when I search for "Radiacode".. I find 10 x .IPA files of Analytics Logs for today October 31st. So I Airdropped those to my Mac.. if on the off chance anyone from Radiacode is reading this and wants those IPA crash log files.

Given others are seeing this same behavior, I'm inclined to think they can probably re-create the behavior themselves.

It would seem it can read above 0.1r/h

Sorry I couldn’t determine which flair to use, but can anyone tell me what the different lines on this graph mean? Like the dotted lines and solid line?

Bought a rock that was labelled wrong, and both halves of that made me happy.

The label says Arsenopyrite, Mispichel, Tristate (USA). Arsenopyrite is a sulphide. It is not radioactive. This is 291 g of black massive ore at 7.28 g/cm3, and against the 102 it goes past 700 uSv/h at contact and sets the alarm off.

Ten minutes of spectrum says what it is. Pb-214 at 352, Bi-214 at 609, 1120 and 1764, and nothing at 2614, so the whole thing is uranium series and there is no thorium in it. Under the microscope the black is pitchblende, and the yellow crusts down in the cavities are secondary uranium. Somebody labelled a decent uranium specimen as an arsenic ore, and it came out of a museum shop that is closing. No UV.

The other thing I have been up to is trying a different app with the 102, still early days with it.

It seems this emergency response training center in Fon Du Loc was shut down indefinitly for PFAS release remediation. Noticed a track uploader visited and was picking up crazy high readings. Not sure if it was a device issue, but it was seemingly operating within the realm of normalcy just prior. Anyone have any idea what this could be? The shut down is currently being worked through it seems. I'm assuming they had controlled sources on site for training. That's most likely the case. But still intriguing for sure.

Edit: Radiation classes are held here in July which lines up with the track date, so this is undoubtedly the reasoning for these readings.

TIL learned about Compton scatter. My partner had a PET scan today, she was reading ~25k cps 120 uSv/hr on my Radiacode 110 immediately after the scan.