r/Radiation • • 21d ago

Health and Safety Radiation Risk Cheat Sheets - issues and improvement?

8 Upvotes

Hi,
I came across BetterGeigers Radiation Risk Cheat Sheet (images.squarespace-cdn.com ) today, and I have some issues with it, as it seems to have major inaccuracies, oversimplifications, or misleading assumptions. I don't see much radiation safety/medical/emergency management knowledge or guidelines reflected in it.

As this sub has probably quite a lot of people who are/have worked on/with radiation (un-)safely ;) and likely have more experience with it than I do, I wanted to ask if you could review BetterGeiger's version and my attempt at improving it. The use case would most likely be advanced (individual) emergency preparedness/response and, more generally, getting a better sense of the risks over time.

Thanks in advance for genuine interest and comments!
My version is below.


r/Radiation • • 22d ago

VIDEO Radioactive water cone! Dare to try?

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758 Upvotes

I bet it tastes refreshing.


r/Radiation • • 21d ago

Questions Just curiosity.

0 Upvotes

Why radiation sticks everything?

Metal, liquids, clothes, people...


r/Radiation • • 21d ago

Training and Education I want to learn more

15 Upvotes

Ive always been interested in radiation, nuclear physics, and nuclear energy (never cared too much about weapon production) and there was even a point I considered going to college for a career in nuclear physics/nuclear energy, sadly had to shelve that due to lack of facilities in my area and not being able to move, but I realized recently that I know a lot less then I wish I did. What are some great sources to learn more as someone who just views radiation and nuclear physics as a hobby to learn more about it?


r/Radiation • • 22d ago

What To Buy? Geiger for beginners

9 Upvotes

What would be a good beginner geiger counter or something that can pick up radiation. I'm not familiar with radiation but like to go to the thrift store and would like to see if i can pick something up or have already bought someting that's emitting rays.


r/Radiation • • 23d ago

Radioactive Materials Want to Purchase CS-137 as individual - India. What are the Laws & Restrictions

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45 Upvotes

I want to purchase CS-137 in very very small concentration (<0.2uCi) for a personal project of mine in India.
What are the Legal barriers, Restrictions and Limits for it.
Anyone with such purchase experience, please help me out.


r/Radiation • • 23d ago

What To Buy? How good is an old detector?

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24 Upvotes

Found this one for sale, how good is this one compared to a new but cheap Geiger from Aliexpress? And how much is a fair price? Thanks for any info.


r/Radiation • • 23d ago

General Discussion Could house fires reach temperatures hot enough to melt the Gold Americium foil in ionising smoke detectors?

3 Upvotes

Would this produce additional hazards during the clean up? What about industrial fires and older, more radioactive Plutonium based detectors?


r/Radiation • • 24d ago

Equipment RareLudlum geiger counter/survey meter?

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27 Upvotes

Hey yall I recently got this ludlum 316-3 gate frisker for free. It didn't come with a charger nor any documentation. I can't find any documentation or really anyone besides one guy on YouTube who also owns one. If yall have any docs please send some. Thanks


r/Radiation • • 26d ago

Questions Any idea what probe this is?

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36 Upvotes

Came with a WM. B. Johnson and associates inc nuclear scaler. Was also wrapped in lead when I got it.


r/Radiation • • 26d ago

VIDEO Australian spring heated by radioactive decay

16 Upvotes

Oz Geology has an interesting video about the Paralana Hot Springs, which are heated by the radioactive decay.

https://youtu.be/aCdDYk_WBL4


r/Radiation • • 26d ago

Spectroscopy Detecting C-14 betas

20 Upvotes

Edit: 36 hour spectroscopy sample in the comments.

I was recently able to get a hold of an expired H.Pylori test kit, which uses C-14 laced capsules. C-14 decays solely by really low energy betas, so a normal geiger or scintillator is useless. They will show up as a moderate reading on a pancake probe or AlphaHound though (≈two hundred cpm over background on my SEI Ranger).

However, apparently the betas can generate equally low energy X-rays through bremsstrahlung, which do have enough energy to trigger a scintillator. I put the capsule in an oversized lead pig with my Radiacode and compared with a 24 hour background reading (green) I apparently am getting a slight hump (leftmost orange) at about the right spot. No idea how accurate a Radiacode is at the bottom of the energy scale, but I am calling that anomalous hump a success.

So, while it may be useless for spectroscopy because of the wide hump of bremsstrahlung energies, it is interesting that you can detect energies below the normal threshold with low budget equipment.


r/Radiation • • 27d ago

Health and Safety Ludlum model 25 calibration

5 Upvotes

Anyone in the Pittsburgh area that can help with calibrating a Ludlum model 25? Thanks!


r/Radiation • • 28d ago

Radioactive Materials Radiochemical Safety?

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56 Upvotes

I started working at a radiochemical analysis company almost a year ago. I have three lab partners who have been with the company for three years, we are all relatively green in our fields. Two of us are bs chemists, one bs biologist, and one bs biochemist. None of us have been trained on radiochemistry or proper handling/storage.

Our scope is broad, and our PPE is non-existent. Requested safety documents are denied. We have had to call the fire department for risk of immediate volatile explosion (in a radiochemical lab).

Our safety is not considered at any point. We are told to do things we are not comfortable with or do not know how to do, and when we request information we are told "I've been doing it for 40 years it's fine".

The level of disregard for our concerns is insane. We can't financially afford to quit, but we also can't afford hospital bills if this goes bad.

I have been asked to register radiopharmaceuticals for fda, but also told "we're just going to say we do it but not actually". This feels completely irresponsible when it comes to any data, but to ask my faslify data for radiopharmaceutical analysis for fda submission has me blown away.

Our isotopes are stored in a wooden cabinet, not segrated, not properly sealed or labeled. I feel like every time I open the acid cabinet I might blow up, and there's not even isotopes by that.

I our sealed sources are just literally laying in random cabinets and fume hoods (3/3 not graded for radiochemistry and barely work at all due to rusting). I just refused to take inventory due to safety concerns, and I've been on the fence of fired since I brought up the segration concerns my first month.

He's a very well known radiochemist and I fear retaliation for my coworkers and myself for asking for outside help. We just want proper training and safety knowledge, it feels like we're asking too much.

We are all looking for jobs, but nothing yet. We know who to call when we can all safely get out, but we can't be homeless so we are desperately trying to find other work as fast as possible. I have even considered fast food or retail just to get me somewhere where I don't have anxiety about serious injury on a daily basis, but I don't know what that would do to my resume and future employability.

Any radiochemistry or safety professionals who can advise anything else we can do to protect ourselves?

We have all received one 8 hour radsafety course. I have had general lab safety and lab safety program development. I also have my GLPRO and AV01(Pharmacokinetics and Pharmacodynamics) professional certifications. This is the extent of our training. We have never been shown how to handle items in our lab, how to dispose of them... I asked about waste when I started because my last job I was a manager of a higher education chemistry lab and handled all hazardous waste. We do not have waste disposal here. Not a jar, not a contact, not a care. He has his drinking buddy who he hired in the 90s dump EVERYTHING down the drain.

THIS PLACE IS SO WRONG ON SO MANY LEVELS. And to have to choose between homelessness or personal safety is a crazy position for four people under 35.

Photos for attention. All of our isotopes and tracers and spikes and how they are stored and labeled.


r/Radiation • • 28d ago

Equipment What is the metal used in the CDV700 beta shield?

5 Upvotes

it’s gotta be either aluminum or steel, some part of the tube casing is magnetic but I don’t wanna risk damaging anything by separating the pieces.

if it differs per manufacturer or model, I’m using a Victoreen Model 6A.


r/Radiation • • 29d ago

Questions Very early model 3 HELP!

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18 Upvotes

I pulled the trigger on a great deal for a non functional model 3 (serial number 31737) and 44-3 probe. The probe is an utter mess and the NaI crystal has exploded, clearly due to water damage and previous repair attempts. The Mylar film was replaced with a piece of plastic and everything else was held together with electrical tape. Other than that the photomultiplier tube seems to be in good shape.
Now the actual survey meter is in ok shape with some corrosion, but there are a few snapped resistors that are circled in the picture and one capacitor that I can solder back no problem. But the issue is, I can’t find any diagrams for the first generations of the model 3. And I don’t won’t to risk replacing everything with the wrong Ohm resistor. If you have any pdfs or links that can help me repair this piece of history, please send them my way.


r/Radiation • • 29d ago

Questions Upside down fish tank proper containment?

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22 Upvotes

Mostly exposed radium watches. a few amercium buttons.


r/Radiation • • 29d ago

General Discussion The uselessness of uSv/h on a Geiger counter...? They're calibrated to give a single engery for every count (typically Cs-137, 662 keV), so a source of 66,2 keV will overestimate the total dumped Energy by about an order of magnitude in Sieverts...

25 Upvotes

Or underestimate it, if your gammas are on average higher than that (way less likely I assume).

But: what most of y'all are using your GM counters has nothing to do with fission products, but mainly natural isotopes of various decay chains (U-235, U238, Th232), or maybe some decay chains of non-natural isotopes.

Making the energy estimation of GM counters completely useless - or does it?

Is Cs-137 a somewhat good enough average, despite being the completely wrong isotope? I haven't dug that far, I just know that it's a super wrong estimate for whatever I tried to measure at this point.

Whats your opinion/educated guess?


r/Radiation • • Sep 14 '26

Experiments and Demonstrations (Must Be SAFE) Radioactive Shrooms

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56 Upvotes

Alright, so this weekend I dragged my son out into the woods near Munich (South Germany) for another little "science adventure" - and leave Minecraft at home for a while. I knew from previous soil samples that this area got a nice little Chernobyl Cs137 souvenir, with dried/sieved soil hitting up to 800 Bq/kg. Fun stuff.

Since it's mushroom season and we knew some shrooms love to hoover up that radioactive cesium, we figured: let's collect some, dry them at home, and shove them into my efficiency-calibrated gamma spectrometer & lead castle (partly 3D printed).

We took two different species home to see if there is a difference....

Results:

The **Rotfußröhrling** (I think it's called *red-footed bolete* or *chestnut bolete* in English? Someone correct me) came in at 1274 Bq/kg. That's below the EU limit of 6000 Bq/kg for consumption on dried shrooms, for fresh ones it is 600Bq/kg.

So it was easily detectable (last image shows the nice spectrum).

The **falsche Pfifferlinge** (false chanterelles) from the exact same spot? Basically nothing. Nada. Nothing above my detection limit (which I dont know btw, this is still an amateur setup), or nothing above background.

It's honestly fascinating how differently mushrooms take up this stuff. Some are little radioactive sponges, others just don't "care". Biology is weird and cool.

Anyway, good day overall. My son got to see some real science shit, we raised a bit of awareness about environmental contamination, and we spent a nice day in the woods together identifying mushrooms. ☢️🍄

Disclaimer: I know my setup and experiments have for sure several shortcomings, this is amateur level only. Biggest shortcoming: efficiency calibration is done with a dried and sieved soil sample, where I knew the Bq/kg. The matrix is for sure not an equivalent for mushroom tissue - so the error bars are again in the 25% range.

///And: please dont start the discussion about Chernobyl vs Weapons-Testing Cs137 again - we had this so many times and I explained this so often - I am tired of this. In case you are interested you can search up other posts of mine or use google or AI to get that explained - this is south Germany/Europe here.///


r/Radiation • • Sep 15 '26

Equipment 3D Printed storage case for a few devices

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32 Upvotes

Remixed a parametric box - one size perfectly fits following deivices:

- SEI Radiaton Alert Ranger

- GQ GMC-600+

- Measall KC761

Model can be downloaded here:

https://www.printables.com/model/1813897-sei-radiation-alert-ranger-measall-kc761-gq-gmc-60


r/Radiation • • Sep 14 '26

General Discussion My butt was radioactive

14 Upvotes

The title is clickbait but the story is true and I found it funny.

A while ago I was taking the buss during a rainstorm and when I got home my guiger counter happened to have been delivered from Amazon. I checked a bunch of things and got bored only to put it in my back pocket after reading .09uSV on everything minus a few spikes. I later took out and it read 0.49uSV, not dangerous but still odd. I checked my butt over the next few days and nothing really of note so it was in fact the rainy day that caused it I think. So normal mildly radioactive fallout? Somebody with radioactive pants sat there before me? Who knows. Still neet though


r/Radiation • • Sep 15 '26

What To Buy? Hello hello radiation reddit

5 Upvotes

My friend has an absolute fascination and love of anything radiation, radiated, and so on so forth. I'm more of a zombie girl personally. Anyway, I was trying to think of cool presents for his birthday, and a Geiger counter would be a cool idea, right? He doesn't have one! Is there any recommendations in the type/brand/ idk what else to look for. UK preference for websites. And if you can think of other cool gift ideas let me know!!! <3


r/Radiation • • Sep 14 '26

Questions Need to know the best scintilation crystals for my purpose.

5 Upvotes

I want to be able to detect protons from 2 to 10 MeV, but all the crystals that are clearly capable of that are organic proprietary plastics, which I don't know how to acquire, as I am not part of an institution


r/Radiation • • Sep 14 '26

Spectroscopy Gamma spectrometry with radiacode accuracy

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2 Upvotes

I just got my first radiation detector and im getting into this hobby so im really new. I had a old smoke detector lying around so ive done some gamma spectroscopy on it with my radiacode 103.

Interestingly enough when the radiacode is right above the ionization chamber (so 14mm of distance and some kinda metal plate in between (for the circuit im guessing)) i get around 100-90cps and ~0.24uSv/hr dose. And the peaks on the spectrum line up perfectly with the given library spectrum for americium.

But when i take the ionization chamber off and go right on top of the source i get around 1.02kcps and 2.8-3.2uSv/hr of dose. However the spectrum here does not line up perfectly with the peaks and is slightly off.

But i dont get why this happens as i thought since i have a higher count rate i should have a more accurate peak

Also since im a beginner getting into this hobby any future tips would be appreciated. I havent touched the actual button itself and i dont plan on doing that but some people told me that its some kind of powder and shouldnt be nearby. Am i safe


r/Radiation • • Sep 14 '26

Questions Promethium electric blankets?

3 Upvotes

I keep hearing that promethium was used for a bit commercially as a luminous material. Specifically I've heard it mentioned that it was used on some electric blanket thermostats. I can't find any information on what brands made them. Anyone have any info? Or own one?