Ultralight keychain size. It's not as sensitive as scintillators but it reacts quickly. The best thing is that I can carry it everywhere. Just disappears in the pocket and is affordable enough as a first Geiger counter.

Technically they say it's a dosimeter. Sorry for the naive question but what's the difference between a Geiger counter and a dosimeter. Afaik it shows accumulated dose but it also shows live readings and it's GM tube based so shouldn't it be a Geiger counter as well?

I just ordered a Radiacode 102. I have some Vasaline and Uranium Glass. But I am wanting more sources. Ores maybe trenitite, I know I can get some from old smoke dectors. But I am wanting some others. "Safe" Stuff to start out with before getting anything hot or that I would need paper work for. Any ideas?

I am not nearly as knowledgeable on the subject as most are here, so I do apologize for that upfront.

I have a radiacode 10, which measures inside of my bathroom and bedroom around 53.4nSv/h up to 58nSv/h.

I just happened to read the first number I listed before I got into the shower. I take decently hot showers, more than enough to steam the room up by accident.

I got out and went to pat it dry just in case, but before I started to I noticed it dropped down to about 36.4nSv/h. It has NEVER read that low in my house before.

I begun to wonder: could increased water molecules in the air act as a sort of temporary "barrier/medium" for ionizing radiation to to influence before it reaches my scintillator? As the steam cleared it has since started to read normal levels again (currently between 50.3-51.2nSv/h.) I know temperature can affect the Radiacode's readings as well, but I am not yet sure.

I have not found much in relation to the subject that fits most of the criteria of this experience (closed-room, single detection source, random background radiation and poor parameters on my end, but still distinct enough from say outside of a single room or even the house; most of what I read measured a large land's-worth of humidity instead and average radiation from multiple sources)

Hey, quick question! I've had a sbt-10a for a few years, and while it's quite good, I've noticed it gets overwhelmed very easily. I have a radiacode 103 but I run that SBT on the cheap cajoe boards from AliExpress, it won't go over ~190k cpm. I'm absolutely sure the source would give over 190k, it reaches that from a certain distance then gets saturated and starts to drop. Just wanted to know, how high should it go? I've tried using individual 10 megaohm resistors with each anode, but that didn't help much.

Thanks!

(Also, here's the 3d printed probe I'm building for it)

I wany to buy Exploranium GR-135 but i don't know if it would be possible to ship to Poland because of the check source and the Seller won't ship directly. Does anyone know what to do?

Will be posting more vids from that trip. Anyone know what that puck is?

It is an accumulation of secondary uranium minerals deposited by rainwater.

Althrough It isn't visible in the video, the compresor pipe (used to supply air or pump out water) is right next to It.

Edit: My brother recorded the video, not me. When he showed me how he’d done it, I scolded him for the stupid thing he’d done; we went down to a fountain to wash his hands, then used a whole pack of wet wipes to make sure nothing was left, and finally washed them again in the shower.

As for the device, I took off the case and washed it thoroughly in the same way.

Would ideally like to find some sheets

You! Turkish Redditor,
We all know and love r/Radiation already, but wouldn’t it be nice to have a place where we can discuss, converse, learn and research all in our native tongue?
Wouldn’t we want to create and grow a Turkish radiation community on Reddit? If so, r/radyasyon is waiting for you! All kinds of enthusiasts are welcome, whether you join to share your geiger collection or uranium glass collection, or to share your moments, or to question the very essence of Radiation, or to simply sip a cup of tea and chat with us and ask us about radiation… you’re welcome to the Turkish Enthusiasts’ heart of Ionizing Radiation, r/radyasyon!

Here is the link for the Turkish welcome message

https://www.reddit.com/r/radyasyon/s/vztr40pcC1

See you in r/radyasyon!

I’ve got a very rudimentary knowledge of the subject of radiation so any knowledge would be helpful. I know they are detectors of some sort but aside from a quick google search of the brands I don’t know much about them. Thought they were neat and wanted to share and learn more, thanks.

I mean it looks like an n for neutrons but that sounds so petty. Its certainly not something Id imagine measuring with a Piezoelectric dosimeter.

I also know that the letter n is н in cyrillic alphabet…

I then assumed п, the letter p in cyrillic alphabet, protons..? …What?

My assumptions are its none of these, but I thought some of you guys may know

Whats that near ɣ?

Now that I think of it, there’s a low chance ɣ isn’t even G for gamma here, and that would be embarrassing for me of it wasnt.

Edit: off topic but you can’t imagine how hard it was for me to get a clear image of this. 😅

ANSWERED: It actually is n for Neutrons!

Is this a genuine one and what tube is that please?? Radpro gives about .2 usv/h background as hh614 (which matches my gc03) and as m4011 .08 usv/h , confused.

Photo in comment

I have been recruiting for a lab supervisor. I get quite a bit of interest from experienced lab personnel with management/supervisory experience but they tend to fall back when they hear that the role is in the radiation protection department.

Another downside is that many of them are not interested in advancing their careers, and the company is looking for an ambitious person who wants to eventually become a Health Physicist.

She is a history buff and also very interested in science and technology so it’s a nice intersection. I have no technical background in radiation specifically but am also a history/science and technology oriented person and therefore curious about all things associated with the discovery/development of atomic energy.

According to all the data Ive found, these meters (MRAD-103) should be quite reliable, which is weird considering how they use a geiger tube, nonetheless, I am worried if these second hand units actually do still function well and read reasonable doses.
Does anyone here own one of these? What type of battery do they require? Do they actually function well, or has time made them obsolete to use? Whats their response to low and high energy fields? My assumption would be it would suck at low energies because of the claimed metal shielding of the tube, but im still curious anyway. Can they actually go up to 500Rem/hour? 5 sieverts sure is a solid limit for something that fits into my hand id say. But is it actually reliable as its claimed?
And most importantly does the metal shielding block all Beta rays?

You may also give other information you’d think Id need to know if you own one, thanks!

I could not tell if it was coming from the fence or behind the fence. It peaked at over 600 CPM. This a similar post i made on a different sub.

Recently repaired it by replacing the internal ЕМ-4 vacuum tube which had exploded somehow, glad that was the only problem with it. These meters are easy to excite if you place an americium button practically inside the ionization chamber. I don’t recommend it though you can be electrocuted.

6x 2”x4”x8” lead bricks, painted to reduce lead contamination. Pictured is the lead castle itself, the count and dose rates on the Radiacode 103 (in the silicone case) outside then inside the castle, then the shielding potential with a 1uCi (+/- 20%) Co-60 source which was produced on 07/18/2025 outside then inside the castle (measured with the Radiacode 103 in the silicone case, then the Ludlum 2241 using a 44-9 pancake probe). Cheers! This is an estimated 96.43% (using 4.47cps to 0.16cps, the 0.16 was measured later and found to be more accurate than the 0.06) reduction in background!

As the title says, my dad got injected with a radioactive solution for a cardiological test. Out of curiosity I brought my Bosean when I picked him up and it freaked out as soon as he opened the door. The highest dosage was measured at his hear, that's also where the picture was taken. For reference, the backgroundradiation in my car is aroung 0.13μSv

Im aware these devices serve completely different purposes, however I have some questions regarding especially the Zero.

Is it sensitive to Beta rays only and less sensitive to Gamma? Ive heard this from some people now. I strongly prefer Gamma sensitivity.

Is 16cps for 1uSv/h really bad compared to 30cps for 1uSv/h?

Does Zero actually provide meaningful readings below 1msv/h? Ive seen a video of it where it behaves really poorly and another one where its dose reading is significantly off.

I, if possible that is, want to obtain a counter that can measure high levels of gamma radiation, and still want it to be somewhat accurate in low range conditions. At least behave better and give accurate measurements than something like better geiger S-1 or GMC320+…

(I used to own a RC103, but got fed up after its spectrometry behaved badly and no amount of calibrations fixed it, so i had to refund it.

But that was then, I no longer adamantly seek to do basic nor advanced spectroscopy. Might prefer having it, but certainly not the game maker.)

All those aside, is Zero really reliable compared to the 100 series?

Better yet, are there contenders to radiacode for high range performance and accuracy?

Interesting study from Harvard on flight crews having higher cancer rates.

https://hms.harvard.edu/news/pilots-flight-attendants-have-greater-risk-radiation-related-cancer-death-other-professions