File: cherenkov radiation.swf-(6.98 MB, 1280x720, Other)
[_] Anon 2968388 Marked for deletion (old).
>> [_] Anon 2968408 Cherenkov radiation, also known as Vavilov-Cherenkov radiation, (also spelled Čerenkov or Cerenkov) is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium at a speed greater than the phase velocity of light in that medium. The characteristic blue glow of an underwater nuclear reactor is due to Cherenkov radiation. It is named after Soviet scientist Pavel Alekseyevich Cherenkov, the 1958 Nobel Prize winner who was the first to detect it experimentally. A theory of this effect was later developed within the framework of Einstein's special relativity theory by Igor Tamm and Ilya Frank, who also shared the Nobel Prize. Cherenkov radiation had been theoretically predicted by the English polymath Oliver Heaviside in papers published in 1888–1889.
>> [_] Anon 2968411 Very cool. Is this type of radiation necessarily deadly to humans?
>> [_] Anon 2968420 >># Ask Hisashi Ouchi.
>> [_] Anon 2968441 >># The man who experienced the greatest pain and suffering that has ever been experienced by any human being was named Ouchi
>> [_] Anon 2968449 >># Pronounced "oh ooo chee"
>> [_] Anon 2968450 I felt that from here.
>> [_] Anon 2968451 >># ok
>> [_] Anon 2968452 >># Dude shut the fuck up that was a good joke. I didn't even think of it because I mentally pronounced it the real way. >># Thanks for the laugh, anonybro.
>> [_] Anon 2968455 >># Eh, I think the joke is pretty dumb. >Lol, the dudes skin fell off, his DNA was destroyed, and they kept him alive as long as they could to study what happened to him. >His name was "ouchy" lolololol >muh sides!
>> [_] Anon 2968456 >>#
>> [_] Anon 2968464 >># fucking hell. I did not need to read all that I just did. His last words he wrote down were "Mommy Please". No sleep for me tonight
>> [_] Anon 2968469 >># made me lol
>> [_] Anon 2968538 >># came here for this, thanks
>> [_] Anon 2968552 >># Sorry I don't read dissertions to get my laughs, anon
>> [_] friendsofsandwiches 2968569 heJCOplantneededtomixsomehigh-purityenri cheduraniumoxidewithnitricacidtoformurany lnitrateforshipping.Thedissolvingandmixin gbeganonSeptember28,1999.OnthemorningofSe ptember30,1999,threetechnicians,HisashiOu chi,MasatoShinohara,andYutakaYokokawa,wer erunningfuelthroughthelaststepsoftheconve rsionprocess.Tospeeduptheprocess,theymixe dtheoxideandnitricacidin10-literstainless steelbucketsratherthaninthedissolvingtank .Indoingso,theyfollowedthepracticethatJCO hadwrittenintoitsoperatingmanualbutwhichh adnotreceivedSTAapproval.Forconvenience,t heyaddedthebucketcontentsdirectlytothe45- cm-diameter,water-jacketedprecipitationta nkratherthantothebuffertank.Thatwasacruci alerrorbecausethetall,narrowgeometryofthe buffertankwasdesignedtoprecludetheonsetof criticality.Infillingtheprecipitationtank ,thecrewaddedsevenbuckets,amountingtoatot alofabout16kg (35 lbs of enriched uranium, or roughly seven times more uranium than permitted under the STA license.
>> [_] friendsofsandwiches 2968572 Thethreetechnicianswereworkinginasmallpr ocessingbay.MasatoShinoharastoodonaplatfo rmandwaspouringtheuranylnitratesolutionin totheprecipitationtankwhileHisashiOuchihe ldaglassfunnelinaninletatthetopofthetank. Thethirdtechnician,YutakaYokokawa,wasseat edatadeskapproximately4meters(13feet)away fromtheprecipitationtank.Atapproximately1 0:35a.m.thetechniciansaddedtheseventhbuck etandsawablueflash.Thetwotechniciansneart hevesselbegantoexperiencepain,wavesofnaus ea,somedifficultyinbreathing,andproblemsw ithmobilityandcoherence.Thegammaradiation alarmsactivatedimmediately.Theblueflashth attheyhadseenwasaresultoftheCherenkovradi ationthatisemittedwhennuclearfissiontakes placeandionizesair.Theadditionofthesevent hbuckethadcausedaself-sustainingchainreac tion.Themixture,inotherwords,hadgonecriti cal.Mixingintheprecipitationtankcausedthe fissileuranium species to disperse so that the reaction fizzled out. However, the critical mass later reassembled, initiating another chain reaction that released more neutrons and gamma radiation. This cycle was repeated several times over many hours
>> [_] friendsofsandwiches 2968574 None of the three technicians realized what had happened. Mr. Ouchi had been draped over the top of the tank and was experiencing the greatest difficulty. The other two workers helped him out of the building in response to the gamma radiation alarms. A worker in an adjoining building noticed the injured and confused technicians and called for medical assistance. An ambulance arrived quickly and removed the affected workers. No one at JCO initially understood the nature of the problem and management eventually requested help from other nearby technical facilities. Uncertainty existed among workers and management about evacuation of the premises or other action that should be taken. Workers were given the option to remain at their jobs or to go home.
>> [_] friendsofsandwiches 2968576 The exact critical mass for the 18.8% uranium mixture in the JCO precipitation tank is not known. In the Joyo reactor, the minimum critical mass for the solid 18.8% uranium fuel is about 46 kg (101 lbs). But the critical mass is greatly reduced when the fuel is in solution because water acts as a "moderator." Light atoms such as hydrogen slow the neutrons released by decaying 235U nuclei between fissions, making it more likely that they will be absorbed and trigger another nucleus to decay. The critical mass was further reduced at Tokaimura because a water jacket surrounding the precipitation tank reflected neutrons back into the tank.
>> [_] friendsofsandwiches 2968577 At 2:30 a.m. on October 1, 1999, JCO staff recognized the need to bring the precipitation tank under control and initiated a plan to drain the cooling jacket. Draining water from the cooling jacket would cause the reaction to cease. This proved difficult and required workers to dismantle pipes leading from the jacket. The workers could work in the irradiated building for only a few minutes at a time. The jacket was later purged with argon. Boric acid (effective for absorbing neutrons) was pumped into the tank in order to mitigate the chain reaction. The reaction was arrested at approximately 6:00 a.m. on October 1. Judging from the levels of gamma and neutron radiation measured near the plant perimeter, the criticality excursion seems to have lasted about 20 hours. After that time, the radiation levels dropped below detection limits.
>> [_] friendsofsandwiches 2968578 okay, does anyone else now feel the need to take a blasting shower and scrub yourself with steel wool?
>> [_] Anon 2968582 >># Link to video please?
>> [_] Anon 2968587 >># Not really as you seem to be describing cleaning procedures, but they don't particularly help with the presence of dangerous radiation.
>> [_] friendsofsandwiches 2968590 >># I know... I know, I just... fuck.. reading all that just makes me all... eeuuuggghghghhgh
>> [_] Anon 2968591 >># Do you have emotions?
>> [_] Officer 2968594 >># Moral of the story: ensure that everything's approved and regulated in your work. Don't take shortcuts and prepare your fighter to go through the gauntlet known as Bureaucracy and come back unscathed.
>> [_] Anon 2968608 i have seen some really fucked up shit in my time on the internets. i think this takes the cake. how the actual fuck is it possible they kept him alive that long, after what happened?
>> [_] Anon 2968611 >># He's dead. Did you know him personally? Why do you care?
>> [_] Anon 2968615 >># They really, really, wanted to see what happens to someone after something like that.
>> [_] Anon 2968624 >># Human empathy doesn't require personal interaction, generally. I suspect you have those feelings, but you can't tell because they're undetectable beneath the stranglehold your mind has over your heart.
>> [_] Anon 2968630 >># Sorry, senpai. I mean, it sucks for him and his family, but it really doesn't affect me. That'd be like if I cried over every starving kid in Africa. Not gonna feel bad over it. People die.
>> [_] Anon 2968633 >># That's okay Kohai. I'll keep you alive, to see what happens.