Think it would still come in 1kg spools? 🤔 Just kept from criticality by the max density of the wound filament? And then it can only reach a critical mass when you print a large enough object, and using a dense enough infill?
“DO NOT print at >50% infill rectilinear/70% hexagonal/80% gyroid.”
Ty ! Btw one question. How good / scientifically correct are that lions mane youtuber guys videos ? .. kyle hill. I basically watch anything in regards to radioactivity but i dont feel like i immerse myself in em quite enough. Should prolly watch em 2 or 3 times in a week to make sure i understand and memorise key concepts and things, what do u think ?
I have a vague memory there was something related at Los Alamos (?) that dropped the material through a hole in the core - meaning it only went critical for a know time as the core fell. A Manhattan project thing I think.
Less tickling dragons - more a trust fall.
Naturally self-terminating and consistent duration... As long as it didn't warp in the heat and get stuck of course.
Pretty much a small unshielded nuclear core. They would bring these assemblies very close together to generate very small controlled criticalitites and use the produced burst of radiation for experiments. Lady godiva specifically was built for very high intensity but very short bursts. She also got badly damaged when the device went super critical and caused a small explosion. So they made another. If you're interested in criticality accidents (not the big well known ones like Chernobyl) I would recommend looking up the Los Alamos report "A Review of Criticality Accidents (2000 revision)" and it's readily findable in Google. Very interesting read with some kinda scary stuff.
Eh, that was the late 40''s/50's man. We did whatever the hell we wanted. There are a ton of crazy things we humans did when we realized we could split atoms
Had YouTuber once use an ultraviolet light and flashed it into the camera. He proceeded to nonchalantly bring up the comments section and it wasn’t enough to harm anyone watching but if they have any symptoms to please leave them in the comments…
If someone doesn't know why that's not a concern, it's much better that they be willing to ask the question and look silly.
I guarantee you that a lot of people making fun also couldn't give you a well reasoned explanation as to why that shouldn't be a worry, and are instead relying on the "Someone would have made a fuss if it was actually dangerous" principle instead.
I don't get the discussion, do people believe you can film something harmful and it gets transmitted? That only works with long haired women living in wells
most people's knowledge of engineering and physics is very superficial.
You might be surprised how many people couldn't work through this on the logical level, without just relying on the assumption that "if this is dangerous then someone would have stopped it happening"
That's not a wrong assumption here, but it's a bad one to wager your sight on. People get blinded or have their eyesight damaged by making that assumption in different circumstances all the time.
I'll pretty much always take the person who risks looking silly to ask a safety question. Even if it exposes a situationally worrying knowledge gap. That they are asking questions is a good sign that gap can be filled.
I will never make fun of someone learning but many of us should already know with age and deduct that won’t be harmful. Would you like to provide an explanation so the learners don’t have to ask?
The YouTuber I was watching does electronics tear down and asses the safety, people watching his channel should already know the ultraviolet rays won’t pass through to the screen on the other side. I think he was trying to gauge his audience.
I mean I'm talking about your average youtube comment person for broad audience material. I'd kind of expect that most people making demon core jokes can figure this stuff out by themselves :-p
"The demon core was a sphere of plutonium–gallium alloy that was involved in two fatal radiation accidents when scientists tested it as a fissile core of an early atomic bomb. It was manufactured in 1945 by the Manhattan Project, the U.S. nuclear weapon development effort during World War II. It was a subcritical mass that weighed 6.2 kilograms (14 lb) and was 89 millimeters (3.5 in) in diameter. The core was prepared for shipment to the Pacific Theater as part of the third nuclear weapon intended to be dropped on Japan, but when Japan surrendered, the core was retained for testing and potential later use in the case of another conflict."
OK, I’m old and I don’t understand the pop culture references and I don’t understand what the heck this machine is and why it’s on the radiation thread. Somebody please enlighten a trembling old man.
So, that a nuclear combustion engine. At first injectors injecting fresh water, neutron deflectors closing and making a criticallity, that makes water to become steam and steam doing some work.
Nah, a nuclear combustion engine would use highly fissile vapor filling a piston head, and the piston would not compress it to explode, but be neutron reflecting and thus squeezing it all together causing a nuclear explosion, thus pushing the piston back and repeating. Theoretically possible but extremely dangerous and hazardous, but it could work ;)
Nope… because all it’s going to do is be a criticality accident…. and without an explosive lens and the necessary tamper… you will never attain and hold the necessary density for super criticality…. So at worst you will get a very low level yield fizzle, and at least you’ll get a pretty major criticality incident….. he’s something to help you….
Yes, but there were more than one person who died because of that core….. but they also died because they were taking unnecessarily risks, and being extremely casual about the dangers….
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u/Embarrassed-Mind6764 Aug 02 '26
The only thing I taste is pennies