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Jonny Nox posted:Therac-25 and radiation therapy machines are a completely different beast to CT. Therac-25 was in a sense also a glorified x-ray machine. Its source was a cathode, just like in an x-ray tube, which emits electrons when current was applied. In one mode, instead of being accelerated to smack into the end of a tube to produce x-rays, they were accelerated to impact the patient's tumor directly. In another mode, a metal target was placed in the path of the electron beam and the electrons would then scatter x-rays off the metal. The way it was supposed to work was that the electron-beam mode was low-current, and the x-ray mode was high current, but the race condition meant that you could enter the high current mode without the target being in place, so you wind up a massive dose of electrons without the shielding target in the way.
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Dec 4, 2019 04:01
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Phanatic posted:Therac-25 was in a sense also a glorified x-ray machine. Its source was a cathode, just like in an x-ray tube, which emits electrons when current was applied. In one mode, instead of being accelerated to smack into the end of a tube to produce x-rays, they were accelerated to impact the patient's tumor directly. In another mode, a metal target was placed in the path of the electron beam and the electrons would then scatter x-rays off the metal. The way it was supposed to work was that the electron-beam mode was low-current, and the x-ray mode was high current, but the race condition meant that you could enter the high current mode without the target being in place, so you wind up a massive dose of electrons without the shielding target in the way. Oh, that makes sense.
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Dec 4, 2019 04:13
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California (and maybe other states)has implemented mandatory dose tracking for ct due to poorly designed cerebral perfusion studies leaving bands of baldness on patients. Also radiation is scary and poorly understood by the general population.
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Dec 4, 2019 04:28
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 We now return you to the horrible radioactive death discussion, already in progress.
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Dec 4, 2019 04:33
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 sure he's wearing stop pants, but still seems scary/unsafe to have your legs so close to the blade.
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Dec 4, 2019 04:38
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its not necessary but usually better to have a buddy help use those milling attachments aka alaskan mills got one sitting in the office right now but im probably not going to use it, lol
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Dec 4, 2019 05:04
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it seems like the rails would stop any serious injuries. The worst that could happen is that it takes 1 inch off your flesh down the front/back of your body in an extremely unlikely worst case scenarion.
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Dec 4, 2019 05:11
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LifeSunDeath posted:
This is a less adventurous version of that one goon's table mounted chainsaw rig, can someone repost it here please?
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Dec 4, 2019 05:19
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Platystemon posted:They use a liquid stored in a reservoir implanted in the abdomen. "reservoir migration" 
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Dec 4, 2019 05:42
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fisting by many posted:"reservoir migration" It could end up somewhere relatively harmless, or it could end up in the bladder. Yes, by digging through the wall. quote:Percutaneous drainage of the cyst was performed, with four litres of purulent fluid evacuated. I’m going to suggest that
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Dec 4, 2019 05:56
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Hexyflexy posted:You're asking me to get the GUI programmers to understand concurrency. I'm not loving god. Maybe hire better programmers?
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Dec 4, 2019 06:09
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"perfortation/erosion"... so there's a 10% chance that this thing will just erode its way through the flesh of one's dick and pop out like rusty rebar
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Dec 4, 2019 06:43
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Pumped Up Dicks is a catchy tune until you listen to the lyrics, then its a song about blowing your dick up like its a little air mattress.
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Dec 4, 2019 07:07
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EvilJoven posted:Pumped Up Dicks is a catchy tune until you listen to the lyrics, then its a song about blowing your dick up like its a little air mattress. Robert's got a quick gland He'll look around the room, he won't tell you his plan He's got a rolled cigarette, hanging out his mouth he's a cowboy kid Yeah he found a prick shootin' gun In his dad's closet hidden oh in a box of fun things, I don't even know what But he's coming for you, yeah he's coming for you All the other pricks with the pumped up dicks You'd better run, better run, faster than sound All the other pricks with the pumped up dicks You'd better run, better run, outrun my blowgun (I'm truly sorry for this) monolithburger fucked around with this message at 11:30 on Dec 4, 2019 |
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Dec 4, 2019 11:18
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monolithburger posted:Robert's got a quick gland 
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Dec 4, 2019 11:36
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Icon Of Sin posted:I don’t think this one is on that list, but I could be mistaken. At any rate, this poor bastard looked directly into the beam of a particle accelerator. I work at a synchrotron light source particle accelerator facility and the sheer amount of work that goes into ensuring no one is ever near the beam is pretty impressive.
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Dec 4, 2019 11:41
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Sex Skeleton posted:Maybe hire better programmers? Nobody likes to design GUIs so you generally end up with people who don't understand the back end. If you want to make sure some idiot mashing the button over and over again doesn't cause a problem, that's up to the back end/firmware developer.
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Dec 4, 2019 11:43
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Jonny Nox posted:It's Goiânia because it always will be, I think you're missing one of the most outrageous facts of this case, the X-Ray tech was called Raven Knickerbocker.
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Dec 4, 2019 11:58
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Super Soaker Party! posted:Are you...are you thinking of Therac? Y'know, THE story of a radiation machine that emitted too much because of operator error? Like, the actual machine whose very name has become a shorthand for design hubris and overreliance on software? It's way too far to blame the Therac-25 on Operator Error, it was and error by the operator but one that could not have happened in the Therac-20 they had been using and one that should not have been possible on the Therac-25.
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Dec 4, 2019 12:02
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Therac-25 is the case study in why you don't move hardware interlocks to software, why you need robust QA on critical systems and why UI design is really, really important. That an 'operator error' caused the deaths is exactly the issue - the system should not have allowed an operator error.
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Dec 4, 2019 12:05
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Blacknose posted:Therac-25 is the case study in why you don't move hardware interlocks to software, why you need robust QA on critical systems and why UI design is really, really important. That an 'operator error' caused the deaths is exactly the issue - the system should not have allowed an operator error. Or rather operator error should always result in the least harmful outcome. You can't eliminate error because you can't read the operator's mind, but you can make sure that screwing up results in lost time rather than irradiated children.
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Dec 4, 2019 12:28
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Kazak posted:This is a less adventurous version of that one goon's table mounted chainsaw rig, can someone repost it here please? https://forums.somethingawful.com/showthread.php?threadid=3902292
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Dec 4, 2019 12:33
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The Lone Badger posted:Or rather operator error should always result in the least harmful outcome. You can't eliminate error because you can't read the operator's mind, but you can make sure that screwing up results in lost time rather than irradiated children. This is exactly what I mean. You have to assume operators will find whole new paths to navigate through your software and do things it shouldn't. The key is that when they do, it should prevent it, not go 'ok lol'
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Dec 4, 2019 12:37
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edited out because fatality involved sorry about it  the driver apparently lived. Dark Off fucked around with this message at 21:30 on Dec 4, 2019 |
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Dec 4, 2019 12:58
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boar guy posted:it's like being a soccer referee This was my job as a teen and it paid pretty well 
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Dec 4, 2019 13:01
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Dark Off posted:https://img-9gag-fun.9cache.com/photo/aV0b5Aw_460sv.mp4 holy poo poo. How?
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Dec 4, 2019 13:05
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LifeSunDeath posted:
Okay, I'm not a carpenter or lumberjack, so can someone explain to me what purpose the hammer has in this enterprise? It's clearly not there by coincidence but I can't figure it out. Dark Off posted:the driver apparently lived. But did all the bystanders at what looks like a bus stop that his car wiped out?! Jesus!
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Dec 4, 2019 13:06
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Dark Off posted:the driver apparently lived. Did the people they seemingly land on also live?
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Dec 4, 2019 13:07
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PurpleXVI posted:Okay, I'm not a carpenter or lumberjack, so can someone explain to me what purpose the hammer has in this enterprise? It's clearly not there by coincidence but I can't figure it out. He uses it to drive wedges in behind the cut, it prevents the weight of the cut board from binding on the rig.
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Dec 4, 2019 13:13
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https://i.imgur.com/Fpha6DY.mp4
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Dec 4, 2019 13:18
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Sex Skeleton posted:Maybe hire better programmers? How? Alternatively: they cost too much! Somewhere up the management chain is someone who definitely couldn't accurately identify a good programmer, and who most likely thinks a good programmer is one who completes their tasks on time without complaints, where "complete" is as defined by someone who knows nothing about programming.
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Dec 4, 2019 13:22
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Hell Yea! Literally A Person posted:I really like working wood. I spend a lot of time in my woodshop loving around with a variety of stupid crap. But get this: lumber is loving expensive. I do go and salvage wood when I get the chance but those chances are few and far between and it sucks to rely on someone wanting to get rid of something to start a project. So it dawned on me, I live in the woods. The woods. Perhaps called that because they contain some amount of wood. So now I can get logs. Problem: logs are big and all of my tools are for dealing with nothing larger than a 4x4" piece of lumber. Solution?
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Dec 4, 2019 13:58
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My favorite part of watching Danger Mill is seeing the piece of wood immediately attempt to leap off the table.
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Dec 4, 2019 14:04
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Woodjumping is an advanced strategy in the home millers repertoire
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Dec 4, 2019 14:09
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bolind posted:Small potatoes in the grand scheme of things, but this was used on the brand new $80 lamp the wife hauled home:  Also winter is here, check y'all's tires the next time you head out to your car. 
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Dec 4, 2019 14:13
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Kazak posted:Woodjumping is an advanced home milling strategy Is there any way to harness kickback for jumpage? I can see a potential fairground level competition in this.
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Dec 4, 2019 14:20
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monolithburger posted:Is there any way to harness kickback for jumpage? I can see a potential fairground level competition in this. You gotta rubberize your setup my dude. All the pros are galvanized
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Dec 4, 2019 14:22
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Wow yikes! The redesigned, safer vertical danger mill looks even MORE DANGER than the horizontal.
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Dec 4, 2019 14:27
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How does a warehouse that size not have a dock to drive that thing off of? WTF
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Dec 4, 2019 14:27
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chrisgt posted:Nobody likes to design GUIs I like to design GUIs  It becomes very obvious after many years of writing software that a huge amount of devs either 1. hate it and half-rear end the entire UI 2. don't actually know how to make a UI that doesn't suck or 3. are designing a UI for something even passingly medicine-related, so it needs to be a fuckfest by the lord's decree. It seems like the quality of the user experience is often roughly equal to the inverse of the risk of the UI killing someone. I've always been curious about the UI/UX of the software involved in mining, industry and stuff like that since it seems like a place where a whole lot could go wrong, but I haven't heard many stories of people bypassing safety interlocks via software quirks, so I guess something is going right? Something related to hardware interlocks and actual safety regulations probably?Also, I was looking more into the Therac-25, as I could have sworn I'd read that an operator just doing their thing normally but kinda fast could make it break (which turned out to be untrue, shockingly), and I found the long and concerning list of civilian radiation accidents worrying amount of people going "oh this cool weird rock that seems to melt all the snow around it would make a nice heater, I immediately trust it and it's my warm friend", also IMMENSE MEDICAL OVERSIGHTS HOLY gently caress quote:November 16, 1992 – Indiana Regional Cancer Center – After treating a patient with HDR brachytherapy, personnel ignored alarms indicating high radiation levels and an available radiation survey meter was not used to confirm or rule out the area alarm's signal. A radioactive pellet of iridium-192 had broken off inside the patient during treatment. The patient was transported back to a nursing home where the catheter containing the radioactive pellet fell out four days later. The patient received a thousand times the intended dose and died several days later.  loving CHRIST. One of them involves a 7 year old girl getting 8 full doses of radiation directly to the brain instead of a single dose over 8 visits, I hate it a lot
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