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Gumbel2Gumbel posted:Got caught texting a backhoe, realizes he made a mistake? It's pretty obvious. computer Enhance
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Jun 21, 2017 23:10
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flosofl posted:
I will furnish my nightclub with stuff like this, along with industry-standard pins
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Jun 21, 2017 23:15
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https://gifsound.com/?gifv=n9X3fue&v=3GRSbr0EYYU&s=13
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Jun 21, 2017 23:15
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 https://nucleardiner.wordpress.com/2017/06/19/a-critical-problem/
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Jun 21, 2017 23:24
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Rollers can apparently loving move if they want to. "I have no idea what this is, I wonder what the big deal i-  "
Kibayasu fucked around with this message at 23:41 on Jun 21, 2017 |
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Jun 21, 2017 23:37
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Jun 22, 2017 00:41
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I'm enjoying the chase vehicle not helping him at all.
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Jun 22, 2017 01:00
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At first the scale of this made them look not look very large and I was like that's not that bad until I noticed the sharpie. That's real dumb.
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Jun 22, 2017 01:05
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I don't even trust ladders on the ground 
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Jun 22, 2017 01:08
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Irradiation posted:At first the scale of this made them look not look very large and I was like that's not that bad until I noticed the sharpie. That's real dumb. Excellent username/post combo. I would love to see a model of the neutron flux going on during that photo
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Jun 22, 2017 01:16
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That's enough plutonium (assuming it is purified and weapons-grade) to make at least one, maybe two bomb cores, right?
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Jun 22, 2017 01:34
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Sagebrush posted:That's enough plutonium (assuming it is purified and weapons-grade) to make at least one, maybe two bomb cores, right? If there is concern that them rolling together could cause a criticality accident on a benchtop, then by definition it’s enough to make at least one bomb core.
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Jun 22, 2017 01:47
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Platystemon posted:If there is concern that them rolling together could cause a criticality accident on a benchtop, then by definition it’s enough to make at least one bomb core. Enough material to sustain criticality is not the same amount as enough material to become prompt supercritical. I still suspect you're right, though.
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Jun 22, 2017 01:52
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Hell, I'll be supercritical if nobody else is going to be: Maybe don't keep explosive radioactive materials sitting about an inch away from each other!
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Jun 22, 2017 01:54
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Relevant regarding criticality: https://www.youtube.com/watch?v=hh89h8FxNhQ (This actually happened.) Three-Phase fucked around with this message at 01:59 on Jun 22, 2017 |
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Jun 22, 2017 01:57
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Sagebrush posted:That's enough plutonium (assuming it is purified and weapons-grade) to make at least one, maybe two bomb cores, right? Almost certainly, I'd say multiple. Even a large modern weapon only requires about 4kg.
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Jun 22, 2017 02:03
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Yes, it's like a lava lamp.
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CJacobs posted:Hell, I'll be supercritical if nobody else is going to be: Maybe don't keep explosive radioactive materials sitting about an inch away from each other! Management for some reason asked for them to be photographed together like that so they were deliberately arranged that way by request.
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Jun 22, 2017 02:07
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Phanatic posted:Enough material to sustain criticality is not the same amount as enough material to become prompt supercritical. Yeah but eight skinny rods is far from an optimal geometry, and there are so many other factors at work in a warhead. If it’s borderline like this, shaping it into a sphere and wrapping it in explosives will easily push it over the edge. Sharpies are five and three‐eighths inches long, if someone feels like doing the arithmetic. e: Actually, the author of that blog post worked it out today and posted an update. Platystemon fucked around with this message at 02:19 on Jun 22, 2017 |
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Jun 22, 2017 02:15
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Stealing this for the next time someone asks me why not just stand around under the forklift load.
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Jun 22, 2017 02:26
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Synthbuttrange posted:Management for some reason asked for them to be photographed together like that so they were deliberately arranged that way by request. Y'know, I think that's an okay cause for telling your manager to go ahead and stuff it.
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Jun 22, 2017 02:33
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The update says that there's about 4kg of plutonium in the picture, and a critical mass is 11kg. That means the critical mass that would sustain a chain reaction in an uncompressed sphere, right? If you have an implosion system and you're okay with blowing everything to bits you can get away with much less?
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Jun 22, 2017 02:39
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Three-Phase posted:Relevant regarding criticality: Whenever someone gets pissed at the movie Prometheus for having all these scientists who behave like idiots, I always point to this scene. They were adjusting that poo poo by tilting a goddamn screwdriver and as a result one of them got to die a slow painful death.
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Jun 22, 2017 02:41
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Sagebrush posted:The update says that there's about 4kg of plutonium in the picture, and a critical mass is 11kg. That means the critical mass that would sustain a chain reaction in an uncompressed sphere, right? If you have an implosion system and you're okay with blowing everything to bits you can get away with much less? Yes. There are a bunch of other things you can do to reduce the mass you need, too, like surrounding the plutonium in a material that reflects neutrons. Here is a primer, with an interactive demonstration.
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Jun 22, 2017 02:52
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Three-Phase posted:Relevant regarding criticality: I've read the story a hundred times but that video is still creepy as hell. What would been the effect if Slotin hadn't pulled the reflectors apart? The official Army report says that everyone in the room would have died, but that would just be because they couldn't get far enough away in time to reduce their dose below a fatal level, right? The assembly wouldn't go off like a nuclear bomb, but I imagine it would probably rapidly melt itself into slag and burn through the floor, emitting intense radiation the whole time.
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Jun 22, 2017 02:53
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Sagebrush posted:I've read the story a hundred times but that video is still creepy as hell. Later analysis showed that self‐heating of the assembly halted the reaction within a small fraction of a second. Slotin’s move had no immediate effect. e: I should add that if the Demond Core had been allowed to cool, it might have contracted and started reacting again, but the worst‐case scenario is that it melts into something that’s not sphere shaped and that halts the process. The reason the fuel in nuclear power plants can tunnel through concrete is that it’s heated by decay. It doesn’t need to react to stay molten. Platystemon fucked around with this message at 03:20 on Jun 22, 2017 |
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Jun 22, 2017 03:00
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Platystemon posted:Yes. There are a bunch of other things you can do to reduce the mass you need, too, like surrounding the plutonium in a material that reflects neutrons. OK I played with that far too long.
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Jun 22, 2017 03:07
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Glazier posted:Here's 20L of water into a volcano Next step is dropping a block of dry ice weighed down so it can travel quickly down because I can imagine it just sitting at the surface. Then the next other step is to go back in time and get solid sodium the military were throwing into a nearby lake because the metal barrels were super corroded and no train company wanted to take the risk. https://www.youtube.com/watch?v=HY7mTCMvpEM Throw one of those in. Though I am not sure if anything in the molten rock would take the sodium ions as well as water.. unless we throw in 20L of water in after it 
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Jun 22, 2017 04:31
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EVIL Gibson posted:Next step is dropping a block of dry ice weighed down so it can travel quickly down because I can imagine it just sitting at the surface. If you drop it from a height, it'll go in - assuming no thick crust on top of the lava. But if you drop it lightly, yes, it'll float. Of course, so will people. Someone did the maths once and worked out, given the difference in density between the human body and molten rock, a human on lava would be equivalent to dropping styrofoam onto engine oil.
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Jun 22, 2017 04:52
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Platystemon posted:Yes. There are a bunch of other things you can do to reduce the mass you need, too, like surrounding the plutonium in a material that reflects neutrons. Like human bodies 
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Jun 22, 2017 05:50
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I guess the actual set-up was deemed too unrealistic for the movie. https://en.wikipedia.org/wiki/Demon_core posted:Slotin, who was given to bravado, became the local expert, performing the test on almost a dozen occasions, often in his trademark blue jeans and cowboy boots, in front of a roomful of observers. Enrico Fermi reportedly told Slotin and others they would be "dead within a year" if they continued performing it. Bonus OSHA points: The same core had already gone critical before when a different scientist dropped a tungsten brick on it. So Math fucked around with this message at 06:04 on Jun 22, 2017 |
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Jun 22, 2017 05:57
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quote:According to those articles, a technician ignored glovebox limits and arranged the plutonium to take that photo for management. A Los Alamos manager is also quoted in the articles as saying that the criticality safety group was an unnecessary expense. A number of the senior people in the criticality safety group were of my vintage and were expected to retire about when I did. According to the articles, management’s signal was heard loud and clear, and the rest left. Every time your boss tells you to do something unsafe so he can feel more efficient, just relax and remember that the same thing would happen even if you were working with loving plutonium.
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Jun 22, 2017 06:34
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https://www.wetp.org More like https://www.wetblanket.org 
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Jun 22, 2017 16:48
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So Math posted:I guess the actual set-up was deemed too unrealistic for the movie. And that's why they called it The Demon Core.
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Jun 22, 2017 17:26
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Is it wrong to want to hit those with a sledge hammer, just to see what would happen?
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Jun 22, 2017 17:33
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DirtRoadJunglist posted:And that's why they called it The Demon Core. They should have kept it around as a curiosity instead of using it for a bomb. Y'know, like how a bull should get to live if it kills a matador.
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Jun 22, 2017 17:33
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https://twitter.com/SkyNews/status/877632095740284930
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Jun 22, 2017 17:40
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Lime Tonics posted:Is it wrong to want to hit those with a sledge hammer, just to see what would happen? IIRC the more spherical they are, the greater the risk of criticality, so flattening them might make them safer.
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Jun 22, 2017 17:42
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Volcott posted:They should have kept it around as a curiosity instead of using it for a bomb. Y'know, like how a bull should get to live if it kills a matador. They didn't use it for a bomb. It was supposed to be used in the Operation Crossroads tests but it ended up not being used due to it's radioactivity levels following the criticality accident. It was eventually melted down and used to make other cores.
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Jun 22, 2017 17:43
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Doc Hawkins posted:Every time your boss tells you to do something unsafe so he can feel more efficient, just relax and remember that the same thing would happen even if you were working with loving plutonium. As I said in the other thread, "It's not critical unless the rods touch."
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Jun 22, 2017 17:55
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Lime Tonics posted:Is it wrong to want to hit those with a sledge hammer, just to see what would happen? Yes; there wouldn't be any risk of a nuclear reaction, but I suspect it would be unsafe for all sorts of other reasons. I am not a chemist, but flattening one of those cylinders would expose lots more of it to the air, and plutonium oxides are pyrophoric, and you really don't want to be breathing any of it in.
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Jun 22, 2017 17:57
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