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Gromit posted:Terrifying! NOPE
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Mar 25, 2016 13:46
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poo poo like that makes me happy that i only have to work with radioactive sources and high voltage power supply in the safety of a basement lab
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Mar 25, 2016 14:29
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SneakyFrog posted:if you arent trying to give yourself superpowers i dont even know what to say i don't want to get in trouble with my supervisor 
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Mar 25, 2016 15:01
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simplyhorribul posted:A type of OSHA question; we had some labs at school about gamma radiation and I found out the piece of safety procedures of neutron source, which really made me squirm. However I tried to google about that later and couldn't find any non-jargon explonation why so hefty procedures. Obviously I understand not to arse with any poo poo that has some form of radiation, but they included looking at the neutron source with mirror instead of straight due the radiation. Why are the eyes such vulnerable organs for it? I mean there wasn't absolutely no other special safety procedures for the neutron sources except this. It's not just the eyes, the neutrons won't be good for any part of your body. The light elements in your body (especially hydrogen, which is present in both organic compounds and water, and that's just about all of you) will slow down the neutrons as they pass through you which deposits energy and creates gamma rays and knocks out protons and electrons into places where they shouldn't be, like inside your cells which can kill them or damage DNA. Viewing a neutron experiment indirectly, with a mirror or through a camera, means that if done right you can see it while keeping enough shielding between the source and you. Edit: Radiation can scatter off of things and reach you indirectly, but neutrons won't really reflect off of glass and metal and hopefully the rest of the facility is designed with that in mind, too. Also, the scattering of radiation off of elements in the atmosphere (skyshine) is why you can't cheap out on shielding by working outdoors and just building walls with no roofs BattleMaster fucked around with this message at 23:08 on Mar 26, 2016 |
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Mar 26, 2016 23:03
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Gorilla Salad posted:We have a tap that comes out at 75°C in the maintenance closet, which is about the same temp as yours. No one really knows why it's there, but our unofficial official use for it is for terrifyingly hot mop water. The lab I work in has signs saying "non-potable water" on all taps and I wonder if there's actually anything unsafe about the water or if they just want to discourage eating and drinking around chemicals and radioisotopes.
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Apr 18, 2016 14:49
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Volume posted:Respect the power tool always respect rotating tools because they'll gently caress you up the most in the shortest amount of time
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May 8, 2016 07:03
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Hot Karl Marx posted:lol shut the gently caress up. When poo poo goes wrong, who dies? The operator, so yeah, i think its in our best interests to know what is going on. If you were smart you would know the people pushing operators to cut costs and use short cuts are the management cause we get paid by the hour and don't care how long things take. Stop acting like your 10x as smart as the the people operatering the equipment cause you guys don't have to to maintenance or repairs either and that poo poo is designed by a retard most of the time. yes it's the engineer who designed the equipment who is retarded, not the operator who decides to exceed the safe limit
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May 11, 2016 17:01
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They don't have batteries but the high voltage flyback transformer has some capacitors on the output that can hold a charge. There are probes where you clip one end to the chassis of the TV and then slip the point under the protective suction-cup looking thing that protects the flyback's anode from accidental touch. That will discharge it. I've never owned a professional version of the tool and I improvised one with a screwdriver taped to a ruler connected to the chassis with an alligator clip. All in all high voltage isn't very scary, it's high power that's nightmare fuel
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May 24, 2016 03:17
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I've heard that if it's off at the time, it merely gives you a painful shock and a good scare but I've never made that mistake myself. It follows because while you're talking about a couple ten thousand volts, it's still just stored in the tiny ceramic caps used in the multiplier circuit of the flyback. I still wouldn't test it out on myself though. You definitely don't want to short it across your body when it's running though, that will likely kill you. I don't know how much of a charge the tube itself can accumulate but it shouldn't be a big deal unless you break the thing open, and in that case the vacuum sending glass flying is probably the scary part.
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May 24, 2016 03:24
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MG3 posted:I've heard that it can be a dangerous shock if you mess up. I want to mess around with a tv I bought but I've been hesitant to try and discharge the electronics. What do you want to do? If you want to fiddle with the recalibration pots you won't be in that much danger from the HV since the HV stuff will all be protected under thick insulators unless you go messing with it. The real danger will probably be the power supply with mains voltage caps and poo poo, but if you know precautions for working with that it shouldn't be a big deal. One hand behind your back, good shoes, watch what you're doing, use insulated tools, etc. edit: if you want to do ill-advised things with the flyback transformer, my advice is don't edit 2: actually, please don't take this as me being a bitch or anything, but don't do anything at all with it unless you have a plan and some experience because i don't have that much confidence from your original inquiry and i don't want to be responsible for a death BattleMaster fucked around with this message at 03:34 on May 24, 2016 |
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May 24, 2016 03:29
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MG3 posted:I want to loop the audio output into the video output to create an oscilloscope at least that would all be dealing with the low-voltage part of the TV and you won't have to go anywhere near the flyback or anything i assume you'd just be connecting L/R audo channels to the horizontal/vertical deflection but the actual process would vary widely between TV models
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May 24, 2016 03:37
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chitoryu12 posted:In the end, the only surefire way to keep cavemen of the year 200,000 CE from uncovering radioactive materials is to put it somewhere they won't find it, like hurling it into space or burying it so deep and secure that only a society that can understand radiation can have the tools necessary to uncover it. yep if you mark it on the surface, the scarier you make it look and the more threatening the messages you use to try to deter people from it the more people will actually think that you're trying to hide lots of treasure from them put it deep enough that hunter-gatherer societies who talk like klingons just won't find it Baronjutter posted:It's really weird how obsessed people are over the safety of nuclear waste in some insane post apocalyptic future but nothing else. The horrible chemical plant down the road? What ever, let our ancestors play in pools of toxic sludge, just so long as it's not mildly radioactive it's all good and nothing to worry about. also this
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May 31, 2016 22:19
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Baronjutter posted:What if a cave man tries to use the ruins of a skyscraper for shelter and gets tetanus from some exposed rebar? Ban rebar until it can be made cave-man safe. If you can't guarantee your building will be safe in 100,000 years and have sufficient statues and sculptures that warn sub-human mutants then you shouldn't be building anything, you're putting future societies at risk. lol
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May 31, 2016 22:22
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HairyManling posted:Aside from being insane, what is SCUBA guy's angry button exactly? He doesn't approve of the gear other divers are using and so fantasizes about killing them for it? He thinks they're too inexperienced for a certain area and again fantasizes about arresting or killing them? I can't seem to figure out exactly what his main beef is. He says that it's supposed to be a satirical look at what could happen if you let government regulation of hobbies get way out of control, but it definitely looks like it became fetishistic at some point
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Jun 2, 2016 04:34
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GnarlyCharlie4u posted:My boss had a counter in his office as part of http://radmon.org/ wanna set one of these up and leave it next to my cobalt-60 source edit: 
BattleMaster fucked around with this message at 22:08 on Jun 2, 2016 |
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Jun 2, 2016 22:02
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GnarlyCharlie4u posted:Why the gently caress do you have a cobalt 60 source? And what do you do with it after it decays? Doesn't it have a halflife of like 5~6 years? I have a set of ~1 microcurie test sources for alphas (polonium-210), betas (strontium-90), and gammas (cobalt-60). They're below legally exempt limits and the recommended procedure for disposal is to deface the radioactive symbols so they don't spook anyone who finds them later. Those levels aren't dangerous to living things but will give G-M counters an alarmingly-high count rate if they're set up to measure background. Polonium-210 has an annoyingly-short half-life but the strontium-90 and cobalt-60 should be good for a big chunk of the rest of my life.
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Jun 3, 2016 05:43
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700-800 mSv over how many years? 
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Jun 4, 2016 05:52
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Kilo147 posted:what is that, about 4-8 rads? (Legacy units, I know) 100 rads is 1 gray and neither are directly equal to any number of sieverts without additional information (they measure absorbed dose versus equivalent dose) edit: to be more specific grays are raw energy absorbed by matter and sieverts have the same units (energy per mass) but are adjusted to better match health effects depending on type of radiation and location of irradiation, etc. BattleMaster fucked around with this message at 08:58 on Jun 4, 2016 |
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Jun 4, 2016 08:49
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it depends on how deep you're going into it, but I mostly wanted to be pedantic about dragging archaic units into it and using the wrong units and the wrong order of magnitude 1:1 is probably the way the dosimeter does it but if you're doing more detailed calculations it turns out that the dose response functions for the same energy of photon can be different for the same flux depending on what direction the flux hits you edit: the 1:1 weighting for a full body photon dose comes from the fact that we really still don't know wtf, the full body weights for the other radiation types are also incredibly rough BattleMaster fucked around with this message at 09:14 on Jun 4, 2016 |
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Jun 4, 2016 09:07
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Kilo147 posted:Yeah, at those levels, hell no. I'm sitting comfortably at about 50 mSv so far on the year, I might hit 70 or 80 mSv by December, and I'm completely fine with that. my Biannual-ish CT scan/X-ray battery is unavoidable. Anything approaching ARS levels and gently caress that noise. yikes
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Jun 4, 2016 09:21
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Kilo147 posted:Between the growths in my liver, growths near the pancreas, and the growths in my lungs, I'm getting a biannual battery of tests to make sure nothing changes. So far it looks like hemangiomas and boring lung nodules, but without biopsying them there's no way to be 100% sure. It's funny, if I were a radiation worker, I'd be pulled from the job by now thanks to that amount of radiation. Sounds like at that point the risk of cancer is less than the risk of not knowing what's going on with that stuff. Have you ever had a PET scan? Those give a pretty big dose but the science behind them is way cool
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Jun 4, 2016 09:28
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Therac-25 is what caused software engineering to become an officially recognized engineering discipline by professional engineering organizations in Canada. Now programmers need to be professional engineers and need a certificate of authorization in order to work on systems that could put public safety at risk and can be legally liable for deaths and injuries. Essentially every form of regulation can be traced back to a pile of bodies and missing limbs
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Jun 6, 2016 13:42
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Would you want to survive falling into something like that though?
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Jun 8, 2016 17:55
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I saw another version of the story where it said his eyes were all white. I guess the lenses rapidly turned opaque from the heat, like getting cataracts but much more rapid? edit:  lol
BattleMaster fucked around with this message at 00:46 on Jun 10, 2016 |
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Jun 10, 2016 00:43
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Lurking Haro posted:And the cake was thrown away. her??? also what was that person trying to do other than ruin a perfectly good cake anyway
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Jun 12, 2016 15:23
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Amazing
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Jun 14, 2016 05:37
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Karma Monkey posted:THIS POOL IS NOT A POOL OF HONOR. this is clearly not intended to help people of the future but is intended to shame people who want to boil themselves today
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Jun 19, 2016 05:00
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Sammus posted:This guy must really, really hate wasps. Wasps are garbage and I have the materials on hand to build that bug zapper so maybe I should try it
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Jun 19, 2016 20:36
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this kills the ant
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Jun 20, 2016 05:59
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the ubiquity of "stop, drop, and roll" as a kid made me think that getting set on fire was a lot more common than it is
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Jun 28, 2016 19:10
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Lurking Haro posted:Is that seriously a third generation copy? Cake was defending itself from some idiot who tried to ruin it
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Jul 6, 2016 09:56
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Jerry Cotton posted:Magical OSHA a lovely trick made much better by the gaffe
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Jul 9, 2016 12:10
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Platystemon posted:
if you think that looks bad then think about what must have happened to the bug!!!
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Jul 23, 2016 01:44
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why does it have handles on both sides?
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Jul 30, 2016 12:48
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spud posted:"MMmmmmm, this water tastes a bit Keroseny....." British soldiers had this problem in WW2 North Africa with fuel cans being reused to haul water. They just manned up and made tea with the water to mask the taste 
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Aug 4, 2016 22:51
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I took a class on risk analysis and I chose elevators because I used to be afraid of them (and in buildings that are tall enough to feel how long the cables are, still am) and learned that most of the people who die because of elevators die by falling into the shaft, either while it is under construction or because they are rescuing someone and gently caress up or try to escape and gently caress up. It seems like if you manage to get into the elevator car you're pretty safe as long as you only try to leave through the door.
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Aug 21, 2016 00:19
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I don't get it, did they manage to completely avoid noticing the very prominent power lines?
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Aug 21, 2016 11:27
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It's not conduction when it's in a vacuum but it's electrons breaking free and travelling through space. It can happen at lower voltages if the metal is hot which was done on purpose in vacuum tube electronics and cathode ray tubes. It can also happen if the metal has a sharp point where the local electric field is strong enough to start pulling electrons off.
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Aug 21, 2016 17:35
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Phanatic posted:Physics. Dielectric strength of a pure vacuum is on the order of a few dozen megavolts per meter, depending strongly on electrode material and shape. If you get a field strong enough that the field effect causes electron emission, those electrons will flow from the cathode to the anode just like in any other circuit; there's nothing in the way, after all. This is what I described but it's not really conduction. Things can't conduct if there's no charge carriers, and a vacuum has nothing in it to be a charge carrier. edit: I mean once current starts to flow there are electrons present and those are charge-carriers but they weren't there at first and originally belonged to whatever they were torn off of BattleMaster fucked around with this message at 11:12 on Aug 22, 2016 |
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Aug 22, 2016 11:04
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Sagebrush posted:Also the ship keeps sending workers to a hell dimension. Functioning as designed. Marked wontfix/closed
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Aug 23, 2016 06:03
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