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I thought it was a joke like those "X-ray" camera apps But actually it's not a joke, it's really cool
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Oct 17, 2015 14:30
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When I got a digital camcorder, one of the first things I did with it was leave it on while it went through an airport x‐ray machine.
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Oct 17, 2015 15:49
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quote:that was a tourist video? Does Houston not have better visited attractions than a construction site?
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Oct 17, 2015 16:50
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I don't think a hardhat would have helped here. This was about 40 minutes from my house. The thing that hit him was a gigantic wooden pad that probably took several people to lift.
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Oct 17, 2015 17:14
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simplefish posted:I thought it was a joke like those "X-ray" camera apps http://www.rdklein.de/ I remember reading somewhere that some of the particle detectors in the ATLAS detector at Cern are also made out of CMOS chips, but I didn't really connect the dots before. Neat.
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Oct 17, 2015 17:23
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Tsuru posted:This is not getting enough love. I bought that app a few days ago, so I can give an opinion and some results from it. On my old HTC Desire (which I resurrected for the purpose of testing this app), despite that the app author rates it as a very good phone for this purpose, the optimal setup produces counts-per-minute so low that they could equally be noise, and only a strong source would be distinguishable from background. On my HTC One Mini (selfie-side camera), I've managed to get a configuration that can distinguish between background and being placed on my "granite" mortar and pestle, and (subject to more readings for confirmation), there appears to be a radiation gradient across my room, possibly indicating a source somewhere; the gradient (if it really exists) is in the opposite direction from that which you would expect, given the orientation of my house and the sedimentary rocks that my basement room is built in... It only detects gamma and some quantity of beta, and if you take an average for less than about an hour, you're not going to get a realistic value for the radiation level in Grays. Now that I have it in the optimal setup and know the background CPM (assuming that my ~20 hours of logging have produced a true low noise setup), I could locate strong sources in real time, if I had such a source available. Edit: having read the linked article, I see that it claims that beta cannot be detected, whereas that crazy German woman who has loads of radioactivity videos on Youtube says that it will detect beta. Placid Marmot fucked around with this message at 19:09 on Oct 17, 2015 |
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Oct 17, 2015 19:06
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I like that the Germans just laugh at it until they realize someone they know might be under it.
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Oct 17, 2015 19:53
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I supervised a student that actually did some measurements with those phone apps using a radioactive source (Cs-137, around 40 microsv/hr at 2 cm distance). Apparently iRad for iOS gave the best results. They were all 2.5x lower than they needed to be, but the standard deviation was low. Radioactivity Counter was a decent alternative (Android and iOS). However, you will need to measure for 5-30 minutes to get a good value, while at a distance of a couple of centimeters, so they're not really useful for quick measurements.
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Oct 17, 2015 20:55
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Oct 17, 2015 21:02
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Samopsa posted:I supervised a student that actually did some measurements with those phone apps using a radioactive source (Cs-137, around 40 microsv/hr at 2 cm distance). Apparently iRad for iOS gave the best results. They were all 2.5x lower than they needed to be, but the standard deviation was low. Radioactivity Counter was a decent alternative (Android and iOS). However, you will need to measure for 5-30 minutes to get a good value, while at a distance of a couple of centimeters, so they're not really useful for quick measurements. The app is great for loving around in areas with reasonably high levels of background radiation. It goes completely bugfuck when you get your face x-rayed, but doesn't really have the discrimination to detect really low dose things without that really long sample time. Fun fact: If you're in an area with sufficiently high flux in the x-ray and gamma spectrum, you start seeing little sparkles in your vision. Your retina, which is complete poo poo at interacting with x-rays and gamma, has enough delicious ionizing radiation passing through it that the rods and cones start spontaneously firing. That or there is enough radiation striking the watery part of your eye that it produces enough Cherenkov radiation to be visible. Either way, your best bet once that starts happening is to ask for a lead lined coffin and blow your brains out, because you're well past the instantaneous fatal dose level, and edging into the 'radiation levels so high your body heats up and cooks to death'. The dipshit who climbed into the Co-60 death room may have experienced that phenomenon, briefly, before he realized how badly he hosed up.
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Oct 17, 2015 21:59
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Methylethylaldehyde posted:The app is great for loving around in areas with reasonably high levels of background radiation. It goes completely bugfuck when you get your face x-rayed, but doesn't really have the discrimination to detect really low dose things without that really long sample time. It's not necessarily anywhere near fatal flux; Apollo astronauts reported the phenomenon, and most of them didn’t die of acute radiation sickness.
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Oct 17, 2015 22:07
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ArcMage posted:It's not necessarily anywhere near fatal flux; Apollo astronauts reported the phenomenon, and most of them didn’t die of acute radiation sickness. Those were cosmic rays, a different beast.
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Oct 17, 2015 23:05
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VectorSigma posted:Those were cosmic rays, a different beast. Ben Grimm nooooo
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Oct 17, 2015 23:48
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Samopsa posted:I supervised a student that actually did some measurements with those phone apps using a radioactive source (Cs-137, around 40 microsv/hr at 2 cm distance). Apparently iRad for iOS gave the best results. They were all 2.5x lower than they needed to be, but the standard deviation was low. Radioactivity Counter was a decent alternative (Android and iOS). However, you will need to measure for 5-30 minutes to get a good value, while at a distance of a couple of centimeters, so they're not really useful for quick measurements. With the one I have - Radioactivity Counter - you can enter the appropriate parameters once you've calibrated your phone with a source, or you can use the parameters given on the author's site, so it should give a relatively accurate reading. The author's site has charts showing the results of tests with calibrated sources (bottom of page) - http://rdklein.de/html/radioa_data.html And videos with a radiation setup that would kill most of the people mentioned in this thread: http://rdklein.de/html/radioa_videos.html (2nd and 3rd videos from bottom)
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Oct 17, 2015 23:51
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Methylethylaldehyde posted:The app is great for loving around in areas with reasonably high levels of background radiation. It goes completely bugfuck when you get your face x-rayed, but doesn't really have the discrimination to detect really low dose things without that really long sample time. I read an anecdote that the first wave of firefighters at Chernobyl felt pins & needles in their faces from the radiation given off by the still-on-fire core. They all died horribly.
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Oct 18, 2015 05:27
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The Dark One posted:I read an anecdote that the first wave of firefighters at Chernobyl felt pins & needles in their faces from the radiation given off by the still-on-fire core. They all died horribly. Any time you read a report that involves feeling physical things in response to radiation generally ends with "And they all died in horrible agony".
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Oct 18, 2015 10:20
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How to load a crate: http://imgur.com/gallery/tTmDc5d (is large, beware mobile data users)
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Oct 18, 2015 13:49
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https://i.imgur.com/RWG8e8n.gifv
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Oct 18, 2015 14:20
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Seriously, put some gloves and hairnets on that's not sanitary. 
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Oct 18, 2015 14:45
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Mo_Steel posted:Seriously, put some gloves and a hairnet on that's not sanitary. it still has to be cooked you know
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Oct 18, 2015 14:47
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Bandsaws freak me the gently caress out. I've never been able to bring myself to use one. (Says the guy who's worked on a 40ft extensible platform truck with no railings or fall protection.  )
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Oct 18, 2015 15:29
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Just.... wow. Dude must get paid cents on the ton to want to go that fast.
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Oct 18, 2015 15:33
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Mo_Steel posted:Seriously, put some gloves and hairnets on that's not sanitary. The 'sanitary' part of handling raw chicken is to not touch other food that won't be cooked to the same extent as the chicken. You don't have to wash hands, utensils, and cooking surfaces to prevent infecting the chicken. Also, that job looks like it has a high turnover rate due to loss of fingers.
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Oct 18, 2015 15:34
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I almost started a small fire in my grade 9 woodshop class when I was having trouble getting the band saw to cut a hard knot or something (it was a large piece of redwood iirc, teacher asked me to cut it for something) and couldn't get pass this one spot. After trying for probably 30ish seconds all of a sudden it started smoking really bad and the teacher ran over and turned it off and yelled at me for being dumb or something (he was a big prick). Turns out there's a lot of heat from friction if you just let it rub on the wood continuously
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Oct 18, 2015 15:35
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Nuclear Pogostick posted:for fucks sake WD40 isn't a lubricant, it's just a water displacer, it's inferior to actual lubes for any lubricating application women often say im a water displacer because they stop being wet when i show up 
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Oct 18, 2015 15:48
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MrYenko posted:Bandsaws freak me the gently caress out. I've never been able to bring myself to use one. As far as saws go they're very safe 'cause they pull the work down against the table. I'm much more comfortable working around bandsaws than table/chop saws et al
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Oct 18, 2015 16:13
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simplefish posted:How to load a crate: No liftgate? No problem.
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Oct 18, 2015 16:34
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simplefish posted:How to load a crate: Coordination between them is amazing. Not even kidding. Unless there's a way to gravity-drop the fork on the small forklift.
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Oct 18, 2015 17:30
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Methylethylaldehyde posted:Fun fact: If you're in an area with sufficiently high flux in the x-ray and gamma spectrum, you start seeing little sparkles in your vision. Your retina, which is complete poo poo at interacting with x-rays and gamma, has enough delicious ionizing radiation passing through it that the rods and cones start spontaneously firing. That or there is enough radiation striking the watery part of your eye that it produces enough Cherenkov radiation to be visible. Either way, your best bet once that starts happening is to ask for a lead lined coffin and blow your brains out, because you're well past the instantaneous fatal dose level, and edging into the 'radiation levels so high your body heats up and cooks to death'. I recalled reading the book "Final Warning" about the Chernobyl accident. There were some workers near the reactor four area that ran to the control room shortly after the explosion. They were exposed to so much radiation that it basically gave their skin a sunburn. They had an interesting conversation with the foreman running the reactor during the test that basically went like this:  We've got to get water to the reactor core! The core is gone. It's exploded, there's nothing their but debris! No the steam generators exploded. We need to get water to the core immediately! The core is gone. The guys who got hit with those extremely high doses died shortly afterwards, including workers who ran to the ruined building to search for coworkers who were crushed under rubble. The just "felt tired" and sat down in the stairwell near the core and never got back up. Will those iPhone meters work on a source as low as 1.5uS per hour, or is that too low? (That's about what you'd get from old depression-era vaseline glass that uses Uranium as a colorant.)
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Oct 18, 2015 18:56
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Out Our Way (February 11, 1928) The lighter side of horrible workplace safety 
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Oct 18, 2015 18:57
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Tunicate posted:Out Our Way (February 11, 1928) How do you say in Hungarian "Once you get out of that machine, you're fired."
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Oct 18, 2015 18:59
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held my breathe the whole way through this, just waiting for the inevitable.
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Oct 18, 2015 19:45
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I hadn't seen this one, just the pork one. I'm sure it's been posted before but I'll repost it just in case (no fingers go missing, don't worry) http://imgur.com/gallery/EzQcJEE
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Oct 18, 2015 20:16
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 A classic tale.
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Oct 18, 2015 20:29
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Three-Phase posted:Will those iPhone meters work on a source as low as 1.5uS per hour, or is that too low? (That's about what you'd get from old depression-era vaseline glass that uses Uranium as a colorant.) That's 10% of the weakest source measured by the author of the Android/iPhone app (not sure about the iPhone-only one), and not only that, but the uranium itself decays by alpha emission, which phones can't detect. There are beta emissions in the decay chain but the range of energies of beta particles that phones will detect is variable, and may be zero, depending whose opinion you trust. In any case, you would have to calibrate the phone to the background level and then leave it against the glass for probably an hour or so to be sure that the reading is above background, but the app is like $3.50, so it's not a big risk to find out and show off to your friends.
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Oct 18, 2015 23:23
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Uthor posted:I got a weather warning yesterday saying that dry weather and high winds could lead to fires out in corn and soy bean fields. Someone should have subscribed to some weather alerts! imagine if he'd thought to have a fire extinguisher on hand as he welded am i the only person who does this
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Oct 19, 2015 00:31
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Placid Marmot posted:That's 10% of the weakest source measured by the author of the Android/iPhone app (not sure about the iPhone-only one), and not only that, but the uranium itself decays by alpha emission, which phones can't detect. There are beta emissions in the decay chain but the range of energies of beta particles that phones will detect is variable, and may be zero, depending whose opinion you trust. In any case, you would have to calibrate the phone to the background level and then leave it against the glass for probably an hour or so to be sure that the reading is above background, but the app is like $3.50, so it's not a big risk to find out and show off to your friends. I have a cheap little Radex digital geiger counter that measures Beta and Gamma. It's a good "around the house" geiger counter. Wouldn't use it elsewhere.
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Oct 19, 2015 00:44
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Three-Phase posted:I have a cheap little Radex digital geiger counter that measures Beta and Gamma. It's a good "around the house" geiger counter. Wouldn't use it elsewhere. I'd ask what the hell you're keeping around your house, but then I look at your avatar and get distracted by China Syndrome youtube clips again.
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Oct 19, 2015 01:47
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Three-Phase posted:I have a cheap little Radex digital geiger counter that measures Beta and Gamma. It's a good "around the house" geiger counter. Wouldn't use it elsewhere. The difference is that you have an actual Geiger counter, as opposed to literally a mobile phone camera. Your Radex should show some response from the uraniumware and maybe give a dosage per hour, but with a phone, you're gambling with your $3.50. Is that a gamble that you can afford????????? ? Ed: I think actually the app is 3.5€ not $3.50, so we're talking high stakes here. Placid Marmot fucked around with this message at 02:17 on Oct 19, 2015 |
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Oct 19, 2015 02:15
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ReagaNOMNOMicks posted:
The rules: sleeves rolled up, shirt tucked in, no jewelry, and for gods sake have respect for a spinning shaft. I almost lost a finger thanks to forgetting about my wedding ring once.
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Oct 19, 2015 02:52
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