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https://twitter.com/stellarstuffs/status/1464656004495265796?t=RwpLLT1ZM-qSios2t6C-aQ&s=19
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Nov 28, 2021 19:11
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Killer robot posted:A funny thing! The first type (the fission gun design) used on Hiroshima was described that way for years, specifically to misdirect from how the actual bomb worked in the opposite way: firing the big hollow cylinder down a tube with a little spike at the end. Which is much easier to manage mechanically. Not to mention much safer, since the target is also in the middle of a bunch of neutron reflectors, and you want to keep as much of the fissionable material as you can out of there right up until business time.
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Nov 28, 2021 19:16
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Hellblazer187 posted:If you know you're 100% going to die in like a week by turning to soup via radiation poisoning... why wouldn't you just blow your brains out to get it over with? I'd jump in front of a car and get spattered like the chemically melted dude from Robocop
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Nov 28, 2021 19:29
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More fun thoughts on radiation turning you to soup: So the places where you're most likely to get cancer (skin, intestines, liver, lungs, uterus, etc.) are the places where you're most rapidly growing new replacement cells. The more often they divide the higher the chance one makes a mistake in the DNA chain, and then that one aberrant cell makes more aberrant cells, and the whole copy of a copy of a copy thing leads to lovely nonfunctional cells that aren't even human anymore, just vague mush with similar properties to a human cell. (This is also why cells that rarely divide, like heart muscle, are far less likely to become cancerous) So say an apple is a human cell. It has the skin, the flesh, stem, core, and seeds. The cancer process would be like throwing the apple in a blender. It's still in concept an apple, but all the parts are not structurally where they should be, and as a cell, it's not going to function. Once the cell can't divide it's just a mush with all the components loosely floating in cytoplasm. So when you get blasted with that insane dose of radiation your heart will keep beating as your guts become the blended apple, your skin liquifies at the cellular level, your lungs turn to gravy, and your blood cells aren't even blood cells anymore, just the goop that makes up blood cells arranged the wrong way. And your heart keeps beating. Pushing dead blood through that necrotic slurry as you die from your extremities inward, until you're just a beating heart moving paste in a smaller and smaller closed loop until the signal to keep beating is finally severed from the brain stem. And you feel every bit of your billions of cells tearing themselves apart the whole time. Merry Christmas, meme thread!
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Nov 28, 2021 19:43
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Do you just enjoy posting medical horror porn or what?
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Nov 28, 2021 19:44
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My least favourite fact about death by radiation poisoning is that towards the end they can't get painkillers into people because their veins aren't strong enough to take a needle and their gut can't absorb anything.
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Nov 28, 2021 19:49
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Thanks goons. I understand the demon core slightly better now.
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Nov 28, 2021 19:51
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Sounds like hospitals should start stocking a single pistol just in case they get an acute radiation guy
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Nov 28, 2021 19:53
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I hear toward the end they just load up a blunderbuss full of ground up advil and ibuprofen and just blast them in the face
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Nov 28, 2021 19:56
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bike tory posted:My least favourite fact about death by radiation poisoning is that towards the end they can't get painkillers into people because their veins aren't strong enough to take a needle and their gut can't absorb anything. Would the fentanyl patches work in this case?
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Nov 28, 2021 19:57
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Zil posted:Do you just enjoy posting medical horror porn or what? My old job was Emergency Management, specifically for chemical and radiation incidents, and before that I was an EMT and CNA, and now I'm doing fire and EMS. I'm a repository of medical horror stories and niche knowledge.
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Nov 28, 2021 20:03
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Zil posted:Would the fentanyl patches work in this case? at that point I want a new skin made of patches so I OD and die
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Nov 28, 2021 20:03
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Zil posted:Would the fentanyl patches work in this case? I hope so, but not sure. Per that post above the skin is one of the first organs to start turning to mush. if anyone is morbidly interested by this poo poo go and read about Ouchi Hisashi who was kept "alive" for 83 days following the highest (known) radiation exposure in the 1999 Tokaimura incident
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Nov 28, 2021 20:14
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ouchi!
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Nov 28, 2021 20:20
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A GLISTENING HODOR posted:https://twitter.com/stellarstuffs/status/1464656004495265796?t=RwpLLT1ZM-qSios2t6C-aQ&s=19 https://www.youtube.com/watch?v=hYAKQ5Crers&t=34s Haven't been able to take the guy seriously since hearing that line.
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Nov 28, 2021 20:24
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ChubbyChecker posted:ouchi! go read about what happened to the guy and see if you still want to make racist jokes about his name 
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Nov 28, 2021 20:28
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https://i.imgur.com/JuPzoWD.mp4
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Nov 28, 2021 20:44
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various people posted:explanations of the Slotin "demon core" incident In case it helps anyone, here's a slightly more in-depth explanation: So you've got some fissile material (plutonium in this case). The deal is that if a fissile nucleus absorbs a neutron, it will fission, producing two smaller nuclei and two free neutrons. These neutrons themselves can then hit other nuclei and cause a chain reaction. But here's the thing: nuclei are really, really small, and relatively far apart. So what are the odds that those two neutrons hit another nucleus before it escapes the core? It depends on a few things: how many atoms of plutonium is it going to pass by, aka how big is this lump of plutonium? What shape is it? Are there other materials nearby that either absorb or reflect neutrons? Taking that all into account, if the probability you find is 50%, then on average, one of the two neutrons will find another atom of plutonium and continue the chain reaction at a steady rate. If it's less than 50%, then odds are, fewer fissions will happen, causing a decrease in the rate of fissioning and so fission dies out, and if the probability is more than 50%, then odds are that more fissions will happen, which causes a runaway exponentially increasing rate of fissioning. The experiment Slotin was doing was designed such that the Demon Core, inside its beryllium sphere, would have that probability be basically barely above 50%. By keeping the beryllium sphere partially open, this allows more neutrons to escape without hitting another plutonium nucleus, reducing the probability to just below 50%. So with the screwdriver in, it was "safe" (in that the levels of radiation would merely cause hella cancer later in life). But when the screwdriver slipped out and the beryllium sphere closed, that exponential growth was triggered, and the reaction got extreme enough to be imminently lethal to Slotin. It's that difference between just under 50% and just over 50% that causes such an extreme difference. A GLISTENING HODOR posted:Now if someone could oversimplification explain the CERN hadron collider. A GLISTENING HODOR posted:How they get from "it go fast" to "oh yeah, there's an inverse negaverse comprised of antimatter" is the part where I feel like they're bullshitting me because that knowledge is so far above my pay grade. So, the faster an object goes, the more energy it has, right? The LHC gets two protons going opposite directions at very near the speed of light, which makes that energy really big (at least, really big for something so small). Specifically, it gets the total energy of these protons up from their rest-mass energy of 2*938 MeV up to a maximum of about 13 TeV, a boost factor of about 6,500. So when they collide, what happens to all this energy? The vast majority of the time, nothing special. The protons glance off one another, maybe release some light, or do other boring stuff. But every once in a while, they collide so straight-on that their energy is super concentrated in a very, very small space. But energy is equivalent to mass, as per E=mc2. So that energy can be converted into other more interesting particles. You know how matter and antimatter can annihilate, turning into high-energy photons or other junk? Well, the same process can happen in reverse. All that extra energy creates matter-antimatter pairs. And also, a lot of the energy becomes kinetic energy, expelling those products at high velocity in random directions. Unfortunately, since protons are big messy particles made up of quarks and gluons, you generally get a big messy explosion of junk - potentially hundreds of random particles. Different kinds of particles are detected in different complicated ways. Information (types and numbers of particles, and their directions and energy/momentum) from the detectors is then saved into a big hard drive, and reviewed later. By piecing together that information, you can trace back the paths of the particles you detected and vaguely piece together what happened. So you can say, "hey, four muons came from this same direction with this much total energy, they probably all came from the same heavy particle decaying." And because of how quantum physics works, these events are more likely if the energy is close to the rest-mass energy of a particular particle. So if you see an abundance of events like that at a particular energy, then you've discovered that there must be a type of particle whose rest-mass energy is that energy. At the LHC, they've discovered the Higgs, at a rest-mass energy of about 125 GeV, which is a relief because without the Higgs our entire theory of particle physics makes no sense. And they've discovered absolutely nothing else new, which is incredibly disappointing because our entire theory of particle physics is still pretty flawed and we really need some new data to drag us out of the quagmire we've been in for the last thirty years.
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Nov 28, 2021 20:45
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holy poo poo, sound
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Nov 28, 2021 20:53
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Nov 28, 2021 21:09
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bike tory posted:go read about what happened to the guy and see if you still want to make racist jokes about his name Nah, every time he comes up somebody makes that joke and it's still funny. We can do better than 83 days, though! https://en.m.wikipedia.org/wiki/Lia_radiological_accident The USSR used to use radioisotope thermoelectric generators to power radio relays deep in the wilderness. One day three villagers gathering firewood found a pair of metal cans sitting in the dirt in the woods. All of the snow around them was melted and the ground was steaming. When they tried to pick up the cans they found they were very hot. Using a wire and a pole, they collected the cans and decided to use them as a heat source that night, sleeping with their backs up against them, and the next day two of them strapped the cans to their backs to stay warm. Of course the cans were the cores from a pair of RTGs and the three villagers got enormous doses of radiation, all ending up in the hospital when they got back to town. The one who only slept next to the cans recovered fairly quickly. The two who carried the cans required skin grafts as the skin on their backs liquefied and sloughed off. One of the three developed a non-healing ulcer across more than two-thirds of his back, and lived for 893 days with this open wound until, despite multiple surgeries and failed skin grafts and stints in intensive care, he eventually died of infection. There is a very extensive PDF report available that has pictures!
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Nov 28, 2021 21:21
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PYF Mmrnmhrm: Post Your Favorite horrific radiation poisoning incidents
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Nov 28, 2021 21:31
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https://youtu.be/6ZIjbX1gj88
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Nov 28, 2021 21:37
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Carbon dioxide posted:What I don't really know is why it's described as only a flash instead of it going on for longer. Does it use up all the nuclear material in that single flash and do they have to replenish it after? Your question has basically been answered, but the reaction needs specific conditions to continue and the result of the reaction (huge energy output) quickly tears down those conditions. One of the big challenges of early nuclear weapons design was holding the core together long enough for sufficient fission to occur, i.e. split enough atoms before the bomb blows itself apart. This was done by having a massive shield called a tamper surrounding the bomb and holding it together for the milliseconds needed. The scientists quickly realised that by greatly increasing the number of neutrons available at the start of the chain reaction, they could split more atoms. So subsequent designs used fusion boosting (pumping in tritium/deuterium to drive a fusion reaction and produce more neutrons) and external neutron generators. These greatly reduced the size of the weapon.
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Nov 28, 2021 21:53
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Nov 28, 2021 21:58
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Nov 28, 2021 21:58
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Nov 28, 2021 22:25
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Nov 28, 2021 22:35
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Who What Now posted:Thanks goons. I understand the demon core slightly better now. 
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Nov 28, 2021 22:40
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Capt.Whorebags posted:Your question has basically been answered, but the reaction needs specific conditions to continue and the result of the reaction (huge energy output) quickly tears down those conditions. I think one of the coolest physical demonstrations of this principle is the natural nuclear reactors that formed in Africa about 1.7 billion years ago: https://en.wikipedia.org/wiki/Natural_nuclear_fission_reactor Summary: nuclear fission is more likely to occur with slow neutrons than fast ones, because slow neutrons are more likely to get captured by a nucleus and destabilize it, where fast ones tend to just whiz by. Water slows down neutrons, so a reactor assembly full of water tends to be more reactive than one that is dry. Billions of years ago, in the ground under what is now Gabon, there was enough of a concentration of uranium-235 that, when water from the surface leaked down into the rocks and moderated the natural neutron emissions, a self-sustaining fission reaction occurred. The reaction would run for about 30 minutes, heating up the rock and boiling out all the water, at which point the reaction would stop. It would cool down for about another two and a half hours, water would seep back in, and the reaction would start again. This three-hour cycle continued for hundreds of thousands of years until it had burned up enough 235U to no longer go critical. This was discovered when French nuclear scientists discovered that the uranium ore they were getting from Gabon was unusually low in 235U. The only explanation at the time was that someone must have been diverting it to make nuclear weapons, so they investigated and eventually found the traces (decay products) of this natural reactor phenomenon. It can no longer happen on earth with natural uranium, because over the past 1.7 billion years the amount of fissile 235U in natural ore has decreased from natural decay.
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Nov 28, 2021 22:58
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RFC2324 posted:holy poo poo, sound Yeah, and they hosed it up by saying Bippity Boppity, when it's Bibbidi Bobbidi. Like almost everyone does.
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Nov 28, 2021 23:00
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They really started innovating and developing new versions after Mambo No. 2, which was poo poo.
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Nov 28, 2021 23:30
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Slotin calling himself “a good bomb putter togetherer” is very funny. He sounded like a bit of a nutter but also a bit of a laugh.
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Nov 28, 2021 23:33
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Kheldarn posted:Yeah, and they hosed it up by saying Bippity Boppity, when it's Bibbidi Bobbidi. Like almost everyone does. it just doesn't need the end bit at all imo. i find it ruins the meme about meeting wizards for no-strings-attached sex
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Nov 29, 2021 01:45
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Kheldarn posted:Yeah, and they hosed it up by saying Bippity Boppity, when it's Bibbidi Bobbidi. Like almost everyone does. https://www.youtube.com/watch?v=c3I0GJihf7s
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Nov 29, 2021 01:54
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Sagebrush posted:I think one of the coolest physical demonstrations of this principle is the natural nuclear reactors that formed in Africa about 1.7 billion years ago: I don’t care if this is true or not and I ain’t gonna fact check it ‘cause I just believe you and it’s cool as hell.
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Nov 29, 2021 02:17
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dialhforhero posted:I don’t care if this is true or not and I ain’t gonna fact check it ‘cause I just believe you and it’s cool as hell. not only is it true and awesome, scientists have also used it to test one of the fundamental properties of the universe, to see if there has been any change in it over the past ~2 billion years.
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Nov 29, 2021 02:37
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Nov 29, 2021 02:39
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what does it mean to be "immune" to no nut november? i think it's stupid and do not follow its prescriptions. am i "immune" to it?
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Nov 29, 2021 02:40
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squeaking in on the page that is also my graphics card
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Nov 29, 2021 02:42
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