Core Vref aging - what's reasonable to expect? Months, years, eons?

[TUMEMBER]

Don't play with uranium. If such high radiation intensity surrounded your patterns, this problem would no longer concern you. Leukemia would simply kill you faster if you saw a measurable effect. In fact, the dominant effect you may be dealing with at "sea level" is the impact of increased Radon levels. Alpha radiation (protons) do not pass through the "metal caps" of LM399 or LTZ 1000. Neutrons pass through 10 cm of Pb without any problems and no one floods the references in the lead block. Cosmic radiation is only a small part of what we get from the Earth's background. Radium, Uranus , Thor are the main emitters of Radon.
https://www.infineon.com/dgdl/Infineon-MOSFET_CoolMOS_CFD7A_Cosmic_Radiation_Assessment-ApplicationNotes-v01_00-EN.pdf?fileId=5546d4627a0b0c7b017a1415c2ef1185&da=t
https://www.renesas.com/us/en/document/whp/using-voltage-references-precision-signal-paths-space-applications
Long and wise, hard to digest.
https://ntrs.nasa.gov/api/citations/20180001142/downloads/20180001142.pdf

[thermistor-guy]

Don't play with uranium. If such high radiation intensity surrounded your patterns, this problem would no longer concern you. Leukemia would simply kill you faster if you saw a measurable effect. ...

I had an interesting experience buying the Uraninite ore sample from Amazon. According to the listing it was safe to ship via USPS:

  Packaging and shipping of the radioactive material comply with the “USPS Packaging Instruction 7A” on shipping of a ‘limited quantity’ of “natural” radioactive materials
specified in 49 CFR 173.42 in the USPS publication 52.

On arrival here, Australian Customs questioned it. I pointed them to the Amazon listing, and Customs let it through.

Testing the sample now, located in its closed metal container: detector sitting on the container: 0.7 uSv/hr (5 x background);
With one mild steel sheet (coffee can lid) in between closed container and detector: 0.5 uSv/hr
With two mild steel sheets: 0.5 uSv/hr (same as one sheet)

So it looks like the mild steel blocks some emission types (alpha particles?), but not all (gamma radiation?).
https://www.radetco.com/your-complete-guide-materials-that-block-radiation/

[iMo]

5x background is nothing. An old WWII wrist watch creates even more today.
Alpha and beta do not penetrate your steel boxes. It is gamma only. For alpha (most dangerous for us when alpha source ingested, otherwise alpha is not penetrating our skin) you would need a special detector, not so common. The common GM tubes do not detect alpha/beta. A common GM tube detects secondary electrons ripped off its metal/glass tubing by a flying through gamma ray.

[TUMEMBER]

For alpha (most dangerous for us when alpha source ingested, otherwise alpha is not penetrating our skin) you would need a special detector, not so common. The common GM tubes do not detect alpha/beta.

And here is the problem. Solid uranite particles "have to be licked" to get into the body. Radon is a gas and you don't have to try hard to get it into your lungs. Just breathe. While uranium glass can be kept for decoration in a room where you spend your daily stay, I would not want to keep an additional Radon emitter in such a room.

I liked the video you posted because it shows how intensely Radon gas works and how massive and dense its impact is.

[iMo]

Thus every voltnut has to get an ion chamber. I already collected some mosfets and cleaned up a tin can from baked beans with tomato sauce It can detect all possible particles including alpha, and it is easy to build.. Best to put the voltage reference inside the chamber, you will get the actual radon doses and ref voltage fluctuations cased by radiation perfectly in sync..