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Pookum posted:I knew someone who had tritium night sights on a gun for coon hunting. He used to leave it under a lamp for a few hours so it would charge with light sorta like those glow in the dark stars you stick to your bedroom ceiling. Those aren't tritium. That's just a guy trying to show off and say he has tritium sights, but really lying.
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Mar 9, 2015 08:34
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Geirskogul posted:Those aren't tritium. That's just a guy trying to show off and say he has tritium sights, but really lying. The tritium key chains I bought from DX 7 years ago are still glowing. No need for charging because it's a radioactive decay powersource. Lamp charged beta decay source?
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Mar 9, 2015 09:01
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Must be hell of a lamp.
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Mar 9, 2015 09:34
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Geirskogul posted:Those aren't tritium. That's just a guy trying to show off and say he has tritium sights, but really lying. Or they are tritium and the dude just thinks he needs to leave them under the lamp. or he doesn't *think* that, just more of a unconscious response due to how other glow in the dark stuff works.
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Mar 9, 2015 09:37
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Magnus Praeda posted:You gotta wonder when they stopped trying to defend that trademark. Is it oops, or had they already made massive bank on it before it started getting banned? I mean, you can buy morphine from anywhere but if you're now addicted to heroin instead and can only buy it from Bayer that's some serious market lock-in.
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Mar 9, 2015 10:46
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I bought a tritium vial keychain a few months ago from a shady Korean vendor. Its cool enough that I bought another for myself and my girlfriend yesterday. I just enjoy the idea of having a vial of radioactive gas hanging from my keychain.
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Mar 9, 2015 19:49
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Just pass it by the giger counter every once in a while.
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Mar 9, 2015 20:08
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Rigged Death Trap posted:Just pass it by the giger counter every once in a while. CPM directly through a tritium vial is lower than background because it's a chunk of plastic that blocks alpha and beta particles.
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Mar 9, 2015 20:29
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Most GITD paints that require charging via light (they charge best off UV light) are Europium based, tritium paints don't require charging.
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Mar 9, 2015 20:44
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kastein posted:Most GITD paints that require charging via light (they charge best off UV light) are Europium based, tritium paints don't require charging. Tritium comes in vials with a phosphor coating on the inside to glow from being hit by electrons. Radioactive paint was made with radium, which is a lot worse than some tritium stuck inside a glass tube. In the first 6 minutes of this video, he holds a geiger counter up to a radium watch and then to a tritium watch. The difference is insane. https://www.youtube.com/watch?v=EVB0F7kORII
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Mar 10, 2015 08:57
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Magnus Praeda posted:You gotta wonder when they stopped trying to defend that trademark. After the First World War, Bayer lost the trademark rights to aspirin and heroin in France, Russia, the UK, and the US under the Treaty of Versailles. They still own Aspirin in other places, including Germany and Canada. I have no idea if they distanced themselves from the heroin trademark.
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Mar 10, 2015 09:36
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jetz0r posted:CPM directly through a tritium vial is lower than background because it's a chunk of plastic that blocks alpha and beta particles. I dont trust shady vendor plastic. Just in case it leaks. Iunno. Tritiums a small rear end particle. Maybe get a shady vendor counter as well.
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Mar 10, 2015 12:52
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Rigged Death Trap posted:I dont trust shady vendor plastic. Exactly. In which case the tiny, low-pressure amount of tritium gas dilutes in the air to safe concentrations in seconds. If you're wearing the thing on your skin, a leak would still giving you a smaller dose than eating a banana does. There's a reason tritium can legally be sold without any kind of permit.
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Mar 10, 2015 13:41
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Rigged Death Trap posted:I dont trust shady vendor plastic. Don't lick, ingest, or chew on the unknown Chinese plastic. It's a much more credible threat to your health than 2 mm^3 of tritium.
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Mar 10, 2015 19:10
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Tritium is mostly a danger when consumed as tritiated water. Heavy water reactors like the CANDUs here in Canada produce fairly large amounts of tritium during their normal operation and some of this inevitably leaks into the environment. We did an experiment in my environmental radiation course where we found a strong correlation between tritium in drinking water and proximity to a nuclear power plant. However, the levels were still far below the regulatory limit - they topped out at like 80 Bq/l compared to the regulatory limit of 1000 Bq/l. The best way to detect tritium in water is to use a liquid scintillation counter, where the water sample is mixed with an organic compound that fluoresces when impacted with a beta particle. This is similar to how the tritium glow in the dark thingies work except the organic scintillant is selected for being sensiting and emitting light highly proportional to the activity of the tritium rather than being bright or having a particular colour. The pulses of light are then counted by the machine with a photomultiplier tube in a dark chamber. Coincidentally if someone is suspected of having consumed a high-activity sample of tritiated water the best way to calculate the dose is to take a urine sample from them and run it through the liquid scintillation counter. Edit: I had a feeling that I posted something like this earlier in the thread and it looks like I had, but it's still pretty relevant
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Mar 10, 2015 19:15
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Liquid Scintillation Counters are really cool. My university had one that was probably from the early 80s which could only be operated using the early 80s computer that came with it originally running some weird DOS. It had an autoloader that worked by having little plastic flags attached to sample bottles press against switches to move them into position. We used it for measuring the activities of tritiated water samples too, I guess thats a pretty common experiment, and also for determining the proportion of 234Th activity in a sample of Uranium nitrate. Scintillators are a pretty interesting thing to study too, and an extremely clever way of measuring radioactivity. We always used to use one called POPOP  .
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Mar 10, 2015 21:53
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Venusian Weasel posted:Speaking of radioactive stuff, I saw a cool video of radioactive elements put into a cloud chamber: 
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Mar 11, 2015 01:44
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GWBBQ posted:If you build a cloud chamber out of a fish tank (you need a big container to be able to see them without getting bored waiting, ) you can see cosmic rays Look at the Americium video, aren't those cosmic rays on the opposite side of the chamber from the source?
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Mar 11, 2015 02:42
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Royal W posted:Look at the Americium video, aren't those cosmic rays on the opposite side of the chamber from the source?
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Mar 11, 2015 14:50
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I asked in the physics thread and a particle physicist (who, by the way, has had one or two awesome Large Hadron Collider Q&A threads you should look up) said that most of the particles not from the Am source are probably from cosmic radiation. http://forums.somethingawful.com/showthread.php?threadid=2880864&pagenumber=228#post442636241 The question also prompted a couple of "now I want to build a cloud chamber" replies. I also want to build one GWBBQ has a new favorite as of 15:28 on Apr 12, 2019 |
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Mar 12, 2015 14:36
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GWBBQ posted:I asked in the physics thread and a particle physicist (who, by the way, has had one or two awesome Large Hadron Collider Q&A threads you should look up) said that most of the particles not from the Am source are probably from cosmic radiation. I looked it up, all you need's a fishtank, some isopropyl alcohol-soaked rags, and dry ice. You line the sides of the tank with the rags, then drop some slices of dry ice into the bottom of the tank. Then just put the lid back on and you start getting supercooled vapor that makes the particle tracks visible.
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Mar 13, 2015 19:38
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Imagine this in the hands of German researchers,,, http://3dprint.com/50777/molecular-3d-printer/ 
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Mar 13, 2015 19:53
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Humbug Scoolbus posted:Imagine this in the hands of German researchers,,, "And one more nitrogen..."
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Mar 13, 2015 19:58
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Humbug Scoolbus posted:Imagine this in the hands of German researchers,,, At least the company that makes the printers would have a very steady source of income 
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Mar 14, 2015 00:21
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Wasabi the J posted:"And one more nitrogen..." "This reaction's mostly useful if you've got a molecular printer that you don't want any more."
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Mar 14, 2015 01:00
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Humbug Scoolbus posted:Imagine this in the hands of German researchers,,, I guess it's 3d in that mass takes up physical space.
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Mar 14, 2015 01:07
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Bip Roberts posted:I guess it's 3d in that mass takes up physical space. If the Germans got involved...very briefly.
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Mar 14, 2015 01:26
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Bip Roberts posted:I guess it's 3d in that mass takes up physical space. Pretty sure it'll get very 3d very quickly if you use it to print high explosives.
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Mar 14, 2015 10:35
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Wasabi the J posted:"And one more nitrogen..." Hexanitro what?
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Mar 14, 2015 11:31
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Wasabi the J posted:"
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Mar 14, 2015 12:28
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Venusian Weasel posted:I looked it up, all you need's a fishtank, some isopropyl alcohol-soaked rags, and dry ice. You line the sides of the tank with the rags, then drop some slices of dry ice into the bottom of the tank. Then just put the lid back on and you start getting supercooled vapor that makes the particle tracks visible.
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Mar 14, 2015 17:52
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Geirskogul posted:Hexanitro what? Hexanitrohexaazaisowurtzitane, AKA CL-20. Probably the best quote from that article: quote:There's a recent report of a method to make a more stable form of it, by mixing it with TNT. Yes, this is an example of something that becomes less explosive as a one-to-one cocrystal with TNT. Although, as the authors point out, if you heat those crystals up the two components separate out, and you're left with crystals of pure CL-20 soaking in liquid TNT, a situation that will heighten your awareness of the fleeting nature of life.
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Mar 14, 2015 22:02
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darthbob88 posted:Hexanitrohexaazaisowurtzitane, AKA CL-20. Probably the best quote from that article: AKA For the love of God! Run!!! 
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Mar 14, 2015 23:10
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Humbug Scoolbus posted:AKA For the love of God! Run!!! If you're around to hear someone telling you to run from something that starts "Hexanitro-", you're not running fast enough.
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Mar 14, 2015 23:39
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Hijo Del Helmsley posted:If you're around to hear someone telling you to run from something that starts "Hexanitro-", you're not running fast enough. quote:Miraculously, nobody was killed, but there was one casualty - the man who had been steadying the cylinder when it split. He was found some five hundred feet away, where he had reached Mach 2 and was still picking up speed when he was stopped by a heart attack.
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Mar 15, 2015 04:31
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My favorite thing about this thread is how someone posts something from Ignition! nearly every other page. It's practically required reading in here.
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Mar 15, 2015 05:47
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Luneshot posted:My favorite thing about this thread is how someone posts something from Ignition! nearly every other page. It's practically required reading in here. A link to the PDF of Ignition! should probably just be put in the OP so no one forgets.
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Mar 15, 2015 06:39
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Shipon posted:A link to the PDF of Ignition! should probably just be put in the OP so no one forgets. It's technically  , so better not.e: never mind, go read it Zopotantor has a new favorite as of 16:04 on Mar 15, 2015 |
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Mar 15, 2015 09:30
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Zopotantor posted:It's technically The spaceflight thread has had it in their op for months and nobody has cared yet.
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Mar 15, 2015 13:04
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Ignition! An informal history of liquid rocket propellants. - Free PDF download via sciencemadness.org
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Mar 15, 2015 15:14
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