Ionizing radiation can’t produce secondary radioactivity in materials…
Comment on Radioactivity
bouh@lemmy.world 2 months agoMarie Curie studied radioactivity with pure and very active materials with no protection. The radioactivity of the notebook is indirect radioactivity, that is material that becomes radioactive after being exposed to powerful ionizing radiations. It must be noted that the notebook may not be deadly radioactive. And if it will be for 1500 years, it won’t be deadly for 1500 years. For reference, bananas tend to be radioactive too. And you are exposed to ionizing radiations when you take the plane.
Chernobyl had two reactors burn iirc. Most of the radioactive material was in the reactor, but the fire made smoke out of radioactive materials. The quantity of smoke, in kg, that go out was significant, but it got diluted in the atmosphere and spread. Which means there wasn’t so much dust, in mass, that got in any one place. The dust is also not only uranium, but a combination of uranium and materials that were contaminated like the notebook. With the rain, the dust was washed and distributed more, and with the time, materials become less and less radioactive.
Both the book and chernobyl are not dangerously radioactive. But because of the nature of radioactivity, care must always be taken.
_bac@lemmy.world 2 months ago
bouh@lemmy.world 2 months ago
Well, maybe explain my confusion then, instead of being an ass.
CommissarVulpin@lemmy.world 2 months ago
So there’s four types of radiation: alpha, beta, gamma, and neutron. When you’re talking about radioactive materials, it’s almost exclusively the first three. In addition to the inherent danger of the object itself, there’s also the danger of radioactive contamination: not making other things radioactive, but shedding bits of themselves as dust and then that dust getting on other things, or getting ingested/inhaled by humans. Active fission reactions, like what goes on in the core of a nuclear reactor (or perhaps messing around with some plutonium and a screwdriver), produce neutron radiation. Neutrons can make other things radioactive, via a process called “neutron activation”, whereby the neutrons bind to the material and change some of the atoms into radioactive isotopes. I hope that helps, and feel free to ask me anything else about radiation. I have some education about it thanks to my job, and I’m always happy to help other people understand it more as well.
bouh@lemmy.world 2 months ago
Ha ! Turns out I’m right after all : radioactivation can happen with all type of radiations. But neutron activation is the lowest energy one.
You are right that it’s probably a contamination for the book though, and not directly an activation (although carbon can be activated and will be found in the book).
bouh@lemmy.world 2 months ago
I know quite a bit about radioactivity thanks to my studies. I was sure all radiations could activate something, but it turns out I was wrong apparently because I can’t find anything but neutron activation.
I’m pretty sure alpha, beta and gamma rays can stick to a particle, often bringing it in an unstable state that will force it to release something to get into a stable state. That’s particle physics. And that’s why we call them ionising radiations : because they turn atoms into ions. But my memories are definitely fuzzy, and it was not were I was the best.
Those radiations may only activate for a too short time to be useful maybe? I don’t know.
Anticorp@lemmy.world 2 months ago
Thanks for the great answer!
roguetrick@lemmy.world 2 months ago
They’re contaminated, not neutron activated. The curies didn’t get to the point of developing an unshielded nuclear reactor that would sufficiently neutron activate their stuff. They just liked to carry around radium and polonium which also have decay products that themselves are radioactive and they contaminated everything.
bouh@lemmy.world 2 months ago
Thanks for the precision. Still, the result is the same I’m sure.
CommissarVulpin@lemmy.world 2 months ago
More or less. The difference is that, if they really wanted to, they could very thoroughly clean the notebook and take most of the contamination off. I’m guessing they won’t because a) It’s a historical artifact and they don’t want to risk damaging it, b) the contamination is so low-level that it’s not dangerous as long as you don’t lick it or something, and/or c) there’s a bit of a shock factor in watching a scientist’s notebook make a Geiger counter freak out.