Putting your hand in Large Hadron Collider... feel the science!

[@VenomTheCat]

4 years later we are still waiting for part 2!

[@VenomTheCat]

Sad but true!

[@rykehuss3435]

+tamenga88 Agreed.

[@urracojalpa4481]

+VladimirCzenishkov Why all you hate Marxism? I'm a Marxist and I'don't like this type of "femnazism" too (nor "femfraudsters" like A.S.). The regular feminism is fine, though.

[@makse10]

+tamenga88 Can we, y'know, get the fuck over it, friendo? I find it amusing that you're taking just as much offense from Vlad's comment as radfems take from the good ol' TF in general. I'm here because SCIENCE IS FUCKING AWESOME. And you're over here whining about someone wishing that radfems were gone so we can focus more on science-y stuff. Instead, how about you go make us some videos talking about the kind of stuff that's in this video and quit complaining? I'd have no problem watching them, given they're accurate.

[@metagen77]

Deadbeat thunderfoot

[@MrRapidPotato]

This video gave me a Hadron.

[@mrmysery1984]

+MrRapidPotato dyslexic people are going to find this hilarious.

[@Rudenbehr]

+mrmysery1984 Hardon?

[@nyx9208]

nice joke

[@lucass5980]

+MrRapidPotato that realy charged me up.

[@lelcetz7628]

lewd

[@markwarnes9786]

where's part 2 ? That's the cliffhanger of all cliffhangers

[@MCWaffles2003-1]

+Thunderf00t im suprised you never mention Anatoli Bugorski, hes a physicist who stuck his head in a 96GeV beam path back in the 70s. the result was his face swelled and he had a perfectly straight line of dead tissue through his skull and brain. funny enough he continued after the hospitalization to getting his PhD

[@imrcreeper1714]

talking about getting shot by a nucleas beam, that is extremely badass tho

[@holdtehmayo]

Any super powers?

[@A-Milkdromeda-Laniakea-Hominid]

I am so glad you commented this, those 2 years ago, I was just thinking about how no one would ever be so dumb as to defeat safety protocols and go near a proton beam. I take that back now; smh. Through his _head_ no less lol. I guess I shouldn't be too surprised, after the Los Alomos demon core incident. The 2nd one especially. Respect science (bitches) geeez.

[@djsmileyoflasvegas]

I watch something about him a couple of months ago the side that was hit didnt age

[@A-Milkdromeda-Laniakea-Hominid]

@@djsmileyoflasvegas I just went to check that out. Indeed, the side that got hit seems frozen in time lol. When he furls his forehead as in deep thought, only one side does that, while the other side isn't even age wrinkling. Still breathing in 2018. Amazing. Thanks.

[@Fredman5551]

EVERYONE! Anatoli Burgorski in 1979 had his FACE caught in a particle accelerator. Look him up! its actually super cool. Spoiler alert: hes alive today!

[@czarpeppers6250]

+Fred H I was just typing about this and then saw this.

[@ChristopherWeaver1]

Yeah its because the hadron escaped and came out of the tube and he was leaning over and it went through it head.

[@DutchGabbers]

+Fred H I heard that, crazy shit.. He even remained working there for many years I belief

[@MariusThePaladin]

So that's what would happens to people getting shot if photon rifle beome a thing huh.

[@ChristopherWeaver1]

MariusThePaladin Thad be a big fucking gun.

[@adriaancanter4573]

+6 years and still waiting for part 2! I read somewhere that because of spalling/energy deposition effects the Chernobyl liquidators would have been better off not wearing any protective lead shielding and wondered if this might be true. Also the demo w/magnets to illustrate the strong force interaction was great.

[@ziggy9403]

As someone from physics, it is really refreshing to see laymen explanations of physical phenomenon that aren't 50% naive or nonsensical. When I am asked to explain things like this I try to not water down the truth just because I can't explain to someone without a mathematical background what a gauge theory or asymptotic freedom is. Feynman was also notoriously good at giving good analogies/explanations of high energy phenomenon. Phil should write a layman's science book. Hawking, Kaku and Greene have the tendency of overstating the "mysteriousness" of quantum mechanics and border on mysticism in their popular science literature. It is really aggravating how pervasive "mystical science" is in our culture. It opens to door to quacks like Deepak Chopra and the like, who do things like dubiously interpret a delocalized wavepacket to mean a particle is existing at several points in space simultaneously. I would regard this mystification of science as a religion in the formation. The New Age crowd has really took misinterpretations of QM and ran with it.

[@Super73VW]

I am about to enter my Radiation Therapy program, and now it finally makes sense on how we vary the treatment depth by varying the beam intensity. Thanks!

[@jackdaniels4975]

Thunderfoot is a much better teacher than my teacher at school tbh... Like the steel ball w/ magnet demonstration. That was really good! My teacher at school is just like "It just HAPPENS like that kay class?!"

[@ohrobert65]

Man, this awesome! You have a real talent for guiding curiosity toward scientfic understanding through thick forests of popular speculation. Thank you.

[@LadyTink]

Part 2?

[@lolcat23]

the steel ball rolling past the magnet was a very good visualisation aid, worked really well. Nice vid!

[@rezafu]

doood u never released part 2 im dyin to hear the complete saga dont leave me hanging

[@DmajikDesign]

I'm still looking forward to the second part! Great work!!

[@YasenBoyadzhiev]

simply brilliant. please just stop bashing femes for a bit and do part 2. best thing ever.

[@YasenBoyadzhiev]

tim whitten True...

[@aorusaki]

facts

[@cobrasixtysix3411]

Can't he do both

[@DemetriosMPapadakes]

Yasen Boyadzhiev please bash feminism and do more science.

[@statinskill]

Yasen Boyadzhiev заткнис сой-бой! Когда он говорит о женщинах, он полностью прав.

[@Nonsensei436]

Its refreshing to get a detailed answer to a question like this. Thanks Thunderf00t.

[@KangasniemiJerri]

sooo....Any chance of part 2 coming out any time soon? 😉

[@rasmodeus1]

yeah i came here into the comments looking for any reference to part 2...

[@c0pperb0ltwire4]

Part 2 still not out...

[@Duncan_Idaho_Potato]

Perhaps he forwent part 2 after the channel he got the idea from actually went to CERN and asked the physicists who work on the LHC the same question. Their answer? In a nutshell, you should probably NOT stick your hand into the proton beam of the LHC. You will have a VERY bad day.

[@LionStrategic]

Published May 2012; Six years, and ~2 days ago. I'm beginning to think part 2 isn't coming

[@monkey505boy]

I'm grateful that someone as brilliant as you is willing to make videos that I can watch.

[@thomasjenkins1387]

Wouldn't it be simpler to just sneak a turkey leg in there and show us the pictures?

[@JayboySmithFreedom]

You cannot access the LHC Tunel from anywhere, its is 200 metres underground and the control room is at 50.

[@marfnl2]

Jayboy Smith You cannot access the LHC Tunel from anywhere? you just sad its underground. I suggest Start Digging!

[@JayboySmithFreedom]

Marfnl disse Unless you had some sort of Diamond Drill, No way to get through and with a Diamond Drill, It'll take around 12 Drills and that costs over 7 Million Pounds Per drill , and to get to 200 Metres it will take over 12 weeks, By that time the Law Enforcement will take over in a matter of hours and you'd be rotting in a jail cell in a couple of day. + If the darn thing gets exposed to the ground and a small crack were to happen, the particles will be traveling at over 3 times the speed of light, That has enough potential to be over 30 times of the Bomb dropped called tzar bomb, It was the largest detonation in the world. The reason the darn thing is so far underground is so that It wouldn't wipe out over 40 Cities.

[@QuakeGamerROTMG]

Jayboy Smith 3 times the speed of light? 3 times faster than the theoretical speed limit of the universe? that sounds like a reasonable argument. Oh and I think you mean the tsar bomba, the largest bomb ever detonated. And can someone please explain why the hell you would need a diamond drill at all let alone 12 of them. Did they build a giant diamond shield around the entire thing that is 100 metres thick

[@marfnl2]

QuakeGamer632 Read the rest i know its long. but the drill's were a joke. How do we get a Turtle in the LHC the LHC is Really Deep so you need a drill to get down there ^,^

[@cephasatheos6627]

Thanks, Dr Phil. You just made my day. I read a catholic book once, on nuclear radiation, and despite the religious overtones, it quite dispassionately described exactly what you did, only without the extra 40+ years of data and knowledge. But it was just so great to hear the facts put into a modern context. Keep up the outstanding work, I'm holding my breath waiting for the "To Be Continued..." Cheers.

[@pforce9]

Good thing I saw this video. The first thing I was going to do if I ever got to France was stick my hand in that collider when it was running,

[@millardfillmore1331]

My cousin already checked..they leave the door unlocked on Tuesday cause the night shift guy works days on Tuesday at a dog grooming shop and forgets his key + he's always late so Friday about 10:05 PM is your best bet. Send us a note after,LOL..better still send us a video before you evaporate and lease wait til after Christmas if you can. Ciao.

[@pforce9]

Millard Fillmore That was BEFORE I saw the video. You don't think I am going to do it now. I am looking for a radioactive spider so if you have any leads, let me know.

[@danielrussell2190]

pforce9 I know just the thing for you: www.amazon.com/Images-SI-Uranium-Ore/dp/B000796XXM

[@pforce9]

Daniel Russell I had one of the old Gilbert Chemistry sets that had an alpha source viewer. Also, every clock in the house had a luminous dial. I think I have my dose for life.

[@ROCKLIKEACOBB]

Daniel Russell OMgosh. That is funny and the customer reviews are even funnier! What in the world?

[@inferosapientia9123]

The more educated you get the more you will realize how little you actually know. I personally like this. Instead of learning leading you to a predictable dull life, learning opens up more questions to ponder and more exciting realms of the unknown to explore.

[@RealEnerjak]

Let's clarify some things. Nuclear radiation is a poison. The chances of being mutated by it aren't even realistic, and furthermore the chances of that mutation being a beneficial evolution, are completely astronomical. Basically, when Peter Parker gets bit by that radioactive spider (assuming it survived anyway) he dies.

[@StefanDim]

Trinexx360 don't kill the Spinderman story, man!

[@Sokar12345]

+Trinexx360 depends on the spider

[@crwydryny]

+Trinexx360 actually anything that results in damage to the DNA will result in a mutation... granted 99.99999...ect% of the time it's going to be cancer... or your next child being born with 2 heads or an extra toe. but if they survive any mutation they devlop will be passed on to the next generation... this is actually how blue eyes developed (about 5000 years ago someone recieved damage to a specific gene (HERC2 gene to be exact) the result is this gene was passed on to their children and so forth (which means that every single blue eyed person is related to one single individual that lived around 5000 years ago... though speaking as a blue eyed person it's not very benificial (we're more seceptible to photophobia) but appariently people like them so blue eyed people keep breeding... so yes radiation is poison, and doesn't mutate you like in the films and the chances of it being benificial are tiny but it does happen but yeah I'm just stretching and what you said is basically true in most cases... but that's the same for everything where evolution is involved some mutations prove to be useless and result in things dying out, others prove to be useful and remain

[@Sokar12345]

crwydryny actually most damage to the dna is either repaired or leads to the cell dying. but yes if a mutation happens and isnt repaired its usually bad.

[@CoffeeTroll]

+Trinexx360 Bummer

[@biznor3]

Thunderfoot is extremely adept at communicating scientific ideas in this format. I'm really looking forward to his next video.

[@KermitFrogThe]

Sorry if I am just being exceptionally dumb, but I cannot find part 2 and really want to watch it. If a responsible adult or intelligent child could reply with the link I would be very grateful.

[@IndigoPath]

I have not been able to find it either and seeing your comment has made me feel a bit better for the fruitless search lol

[@MelioraCogito]

I looked through Thunderf00t's uploaded video listing and didn't find it either - perhaps he got sidetracked with other projects. It's too bad, I do enjoy his exploration of science more than his dissing of anti-intellectuals, conspiracy/creationist crackpots (though they do certainly deserve his bitch-slaps), but it just gets tiring after a while. You can't cure people who deliberately chose to be ignorant.

[@KermitFrogThe]

MelioraCogito In my work I often see incidents where artificial intelligence is beaten into submission by natural stupidity. It is a shame but unfortunately every time I have built something idiot proof they have either upgraded the idiot of I find I have underestimated the true power of stupid people in large numbers. I think there are 2 forms of ignorance. We all have the first which is lack of knowledge we haven't learned and that is acceptable while we are willing to. The second is not acceptable and is when people chose to deliberately ignore information available. Unfortunately while there is a lot of money to be made nurturing such ignorance it will remain common and they will fail to see they are being taken advantage of while others get rich and laugh at them.

[@LiamWilkinstheoneandonly]

It's because this is a stolen video, search "sixty symbols large hadron collider" for the original upload

[@TrueMathSquare]

Liam Wilkins What do you mean?

[@j7ndominica051]

I watch the Sixty Symbols channels regularly. The description given here was better and easy to follow. I appreciate the absence of humour. Thank you.

[@scdefion]

Didn't a Russian Scientist get hit in the head by a proton beam in a particle accelerator and live?

[@yeetman4953]

scdefion sources please.

[@membola]

Anatoli Petrovich Bugorski (Russian: Анатолий Петрович Бугорский, Anatoly Petrovich Bugorsky; born 25 June 1942) is a Russian scientist who was struck by a particle accelerator beam in 1978.[1] (wikipedia). Should come up wth a bunch of stuff if you just google his name also.

[@IndigoPath]

I can't think of any one video of yours that hasn't taught me something or at least giving me a better understanding of something. Thanks again tf00t!

[@matsv201]

Well... yes. But here is a problem. If you talk about radiation therapy the proton pases just one time. The loop is 27km long so every single proton passes about 10 000 times a second. Probobly make a noticible difrance.

[@kkonstantinosss2]

Still, it's better than 10,000*1000000 MEV protons.

[@matsv201]

thats kind of my point,.

[@CorpseTongji]

Your graphs and charts give me a reason to live.

[@invicta1313]

Huh. 8:47, "Large Hardon Collider." That sounds...uncomfortable.

[@invicta1313]

***** LOL...yeah, but you have to admit...as gay porn movies go, sounds like a pretty good theme.

[@MaximusMuleti]

8years later and still waiting for part 2!! Come on Thunderf00t, you can't leave us like this!!

[@afriedli]

Does anyone know where I can find the promised second part? It doesn't seem to be on TF's channel, unless it is hidden under a different title.

[@whiterottenrabbit]

I can't find it either :(

[@Brandt761]

You know incidentally, this video is much more useful than just the collider question. Because I think most people have no idea exactly how and why radiation kills and how it doesn't. Which is confusing to the public when confronted with things like reactor accidents. They think people could be secretly killed by radiation months afterward, but really that only happens when the exposure leads to cancer.

[@notthere83]

So... where is part 2?

[@KinguCooky]

Search for Large Hidden Collider part2

It was ripped off from part 1 from a large hadron collider proton beam.

[@dmorono]

As are all your science videos, this was wonderfully informative. THANKS for this and all your others.

[@peterbucek2136]

8:46 large hardon collider? lol

[@tomaszantochow8391]

+Peter Bucek Dude, you just made my day :D

[@generico366]

That sounds like a sex position.

[@Horny_Fruit_Flies]

Dawkins style!

[@BenjiShock]

" a tillion eV"

[@TheOysterjam]

sounds kinda like a sex position involving at least 2 dudes, probably many

[@13loodLust]

How far we have come in understanding the universe around us makes me cry in joy.

[@nepalihercules]

man i do feel dumb

[@matthewjamesberry7883]

***** Ikr

[@SaelPalani]

This is much better than any video Diaperfilms could ever do! Thanks Thunderf00t!

[@redthompson4927]

SCIENCE FOR THE SCIENCE GOD! Nobody will understand the reference

Kratos also killed the science god anyway

[@pikejohnson6409]

I think I get the reference. SCP foundation? Dr. Bright?

[@Monosandalos]

I've read before about areas with higher background radiation having lower cancer rates. A quick search of papers yields that higher background radiation does not appear to increase (or decrease) rate of cancer in the "affected area" but in some cases changes the ratios between the types of cancer that develop.

[@jmomm]

It is my dream to visit CERN.

[@inquaanate2393]

I went there on a school trip ( I live in the UK). The education system is much better here than in the USA.

[@jimocar760]

paramutt i went there with school aswel (from portugal) and i got to see the ATLAS colider fully open

[@jetibest]

+jmomm But SERN is evil. El Psy Congroo.

[@jimocar760]

Clearly you haven´t reached .1% Divergence

[@jmomm]

Very!

[@timmydirtyrat6015]

Anatoli Petrovich Bugorski was a 19 year ago at the Institute for High Energy Physics in Protvino, Russia, when he stuck his head in the Synchrotron U-70 particle accelerator. He got hit by a particle beam that could have killed him. It burned a whole right through his head. Not the LHC but it's still a particle accelerator. On July 13, 1978, Bugorski was checking a malfunctioning piece of equipment. As he was leaning over the piece of equipment, he stuck his head through the part of the accelerator that the proton beam was running through. He reported seeing a flash that was “brighter than a thousand suns”, but did not feel any pain when this happened. The beam itself measured 2000 gray as it entered Bugorski’s skull and about 3000 gray when it exited on the other side. A “gray” is an SI unit of energy absorbed from ionizing radiation. One gray is equal to the absorption of one joule of radiation energy by one kilogram of matter. An example where this is commonly used is in X-rays. For reference, absorption of over 5 grays at any time usually leads to death within 14 days. However, no one before had ever experienced radiation in the form of a proton beam moving at about the speed of light. Although the skin on the part of his face and back of his head where the beam hit peeled off over the next few days and the beam had burned through his skull and brain tissue, Bugorski did not die and actually came through it all surprisingly well. gizmodo.com/what-happens-when-you-stick-your-head-into-a-particle-a-1171981874/1174437474

[@Poppedcollar]

Molecular bondage...who says science isn't sexy?

[@dying101666]

Poppedcollar and then there's you :/

[@ophigreen2096]

Well, he talks about thelarge hardon collider at 8:45.

[@JoeHartiganFleming]

I just stumbled upon this, and I don't know what became of the promised part 2, whether it was never uploaded, got taken down, or I've simply missed it, but here's my thoughts on the issue. Firstly, a minor correction/addition; he says for cancer risk, a low dose integrated over time equals a larger dose in a short time, and cites a linear relationship. This is the Linear No Threshold (LNT) model, and is not necessarily correct. There are other potential cases for low radiation doses, including the possibility of a threshold where a low dose has no effect, and another possible case is that low doses may be proportionally worse than larger doses. There is little evidence suggesting which model is most accurate, and hence it's possible that the integrated dose and single dose may have different cancer risks. The LNT model is widely used though, and a full discussion was probably way outside the scope of the video. Now, my thoughts on the hand-in-beam... As the beam is circular, we can assume any protons that fail to interact at all will come back round and eventually interact on another pass, so we can assume 100% of protons interact in some way, depositing the tiny fraction of their energy each, as per the therapy beam graphs shown. After the first interaction, there are several possibilities for each proton. I don't have the data to estimate how many with follow each path, but the possibilities are: 1)proton is not sufficiently deflected by interaction, continues back into beam pipe and comes round again 2)proton is scattered away from the beam pipe and away into the surrounding environment 3)proton eventually deposits more energy into the surrounding tissues As anything that is not scattered out or absorbed comes round again, there are only two possibilities for the proton to escape the beam, (scatter out or absorption), and it becomes a question of working out how much is scattered out away from you and how much is absorbed in you. Finally, regardless of how the protons distribute the energy, there's a lot of energy to dispose of. They use huge chunks of material in the actual beam dumps and cool it to take the energy away. If you're deflecting the beam with your hand, the energy will be dumped in your area, regardless of whether it's absorbed in your tissues or the walls etc nearby. That's likely to release a lot of secondary radiation and heat, which could well be more damaging than the original energy deposited.

[@OfKindRock]

Finally a video without drama. And I learned something cool.

[@azaas]

well that's the kind of thunderf00t video we all expected for so long!!!! Thank you very much for your hard work Tf00t! Highly appreciated!

[@boonw]

I like it when he mixes both. Thats why I love the WDPLAC series.

[@tdlawe1223]

Sad to see not more people have watched this video. Thanks for the effort

[@KnightOnlineAshet]

Its so important in science to visualize. I really appreciate Thunderf00t doing all this work and research out of his love of Science. Thankyou!

[@McPrfctday]

I was talking to a friend about that sixty symbols video a while ago saying "all the Nottingham physicists gave a different answer... So no one really knows what would happen". My friend said "I'm pretty sure the people who built the LHC knew what would happen while they were designing it". Good point that.

[@Woopeehole1337]

In another video by sixty symbols on the same subject. One of the faculty at the LHC said that a hadron traveling in the beam carries a "halo" of smaller, lighter particles behind it. This "halo" could then have enough high-energy particles to kill you with radiation. That was one scenario but I am not sure if it is correct. Great video by the way.

[@teirdalin]

9 years later. We are still waiting on part 2.

[@snarky77005]

I feel honored sir. I never thought that someone of your stature would ever respond to a comment made by me. Thank you.

[@qq1648]

Great video Thunderf00t, the bit about faster protons having less time to transfer energy is very interesting. I know that bullets and shells slower than the speed of sound can actually be more lethal to an unarmored target than a hypersonic bullet or shell. This is why the military has considered making tanks that can fire projectiles slower for unarmored target. This is the concept between binary propellant being used for tank shells. I have no idea if it will work as depicted but the principle seems to be spot on: faster projectile cuts through without transferring as much energy.

[@GKuriboh]

A theory in science is defined as an explanation of all observable facts and evidence that has a predictive model, and can be tested and verified. Tests can either be done in a lab or in the field, and the theory can and is modified as new evidence is presented, or even discarded for a more accurate theory is present. Facts are a dime a dozen, a reasonable, workable theory is priceless.

[@DemetriosMPapadakes]

Dude, these videos shouldn't be getting smaller, but bigger. It's also a crime against humanity if you're not a teacher somewhere.

[@Torchmanz]

i love these science vids he used to do. I wish he made more still.

[@jamesdc60]

I'm interested in seeing the conclusion. From what I imagine, not only would it not take your hand off, but the resulting damage would be so insignificant that you might not even feel it, be able to see it, and that if it happens only once... the bonds would re-occur after impact so fast that the event might as well not have happened at all. This reminds me of the penny off the empire state building myth. But I could be wrong, so I want to see what Mr. Foot says!

[@brusselsproutboy7005]

I go back on this video knowing the answer but want to hear you explain it. That’s when you know someone is worth listening to.

[@edgewayround]

As always TF, informative and entertaining with good production. Well done Sir!

[@Luka_3D]

Keep doing these videos! I'm learning 1000000000x times faster than in school!

[@FGuilt]

this is an old vid and I don't know if you will read this, but I'm really glad you took the time to do so. Very interesting info. Thanks.

[@gustavderkits8433]

I did experiments at fermi lab many years ago and saw a cutaway section of a beam line that had been hit by the beam that wandered when a magnet quenched. The steel had been vaporized and melted in a large area before the beam shut down. Lots of energy in that much lower power beam.

[@TheReaverOfDarkness]

I think the only thing in your hand likely to take damage is the nuclei of atoms. So what it boils down to is probably the chance for a proton travelling at high speed to hit a nucleus before exiting your hand. Then you count how many protons are going through your hand, multiply by the chance of a hit, and that's approximately how many nuclei will be struck and presumably destroyed. Collateral damage beyond that may be significant but the main effect is probably the ions reacting.

[@sorabji1]

Engaging, succinct, brilliant ... thanks Thunderf00t!!

[@Metallosaurus]

Best video from you in a while, Phil.

[@silentvoiceinthedark5665]

Awesome educational video Thunderfoot. Love all your videos. Have to show this to my kids

[@emancoy]

I have read a study somewhere that I couldn't recall the source at this time. It shows the probability of getting cancer from a low dose but long term exposure is equal to a high does short term exposure. Providing the total radiation exposure from the low dose long term exposure is equal to the high dose short term exposure. I will share it if I find that journal somewhere.

[@Psykomancer]

A quick rebuttal to your cancer radiation example, TF. A long term radiation dose will have a lesser effect as it gives your cell's genome a chance to repair itself, assuming the p54 gene isn't damaged first. Even so, the cell still has to be damaged enough to ignore intrinsic and extrinsic apoptotic signals in order to have a chance of becoming a tumour cell before being destroyed. A single large dose of radiation has a higher chance of corrupting the cell, rather than a long term weak one.

[@Aezelll]

Interesting. I'm not a physicist, but the first thing I thought of when they asked this was the depth tuning used for cancer radiation therapy, and it turns out I was on the right track.

[@morphicsm]

Fascinating! Almost Khan-Academy-esque, in fact. Keep the videos rolling!

[@Blackadder125]

Very good and educational video. Also, I love the fact that when the stick figures die of radiation sickness, their heads fall off.

[@sluggdiddyyddidgguls]

Great video tfoot.I'm a health physicist working in radiation safety and just wanted to comment on something you said that isn't quite right. The linear no-threshold model which you are claiming as more or less fact, is indeed what is widely accepted and used in the field of radiation safety. But it is accept as a safety precaution not because its been shown to be true as of yet. A few recent studies suggest very low doses may have no observable effect and do not contribute to a cumulative dose.

[@Psykomancer]

This is true if you assume the genome has now way of repairing itself. The p53/TP53 (not p54, sorry for the typo) protein/gene is nicknamed guardian of the genome and is responsible for initiating DNA repair (when damage is detected), halting the cell cycle until the former is finished and, if all else fails, initiate apoptosis (programmed cell death). Even if the p53 was damaged first, other factors must be overcome to make a aner (extrinsic apoptosis, initiation of angiogenesis, etc).

[@ahgflyguy]

I was hoping you'd get to something related to impact cross-sections. Nicely addressed. I got to design a spacecraft with a pair of large tungsten-plate calorimeters a while back. I certainly wouldn't want that particle cascade that takes 5-inch tungsten plates for ~85% energy capture to happen in my body at an artificially enhanced rate.

[@jdavis882]

A person has had their head in the way of the beam before. You can google and find it. If I remember correctly it burnt a hole through his head, but he lived.

[@BoobzTwo]

Interesting question ... wonder how you could get someone's hand in front of the beam though. From the perspective of the energies involved I agree with you, minimal if any damage at all.

[@michaelmaage]

Very informative and interesting. Looking forward to part 2

[@dprjones]

I agree. I've never believed a word that thunderf00t guy has ever said.

[@anubis2814]

Amazing description. Keep these kinds of videos going!

[@LudwigSpiegel]

Thank you! I learnt something new today.....Looking forward to Part 2.

[@Ischmac]

Interesting fact: You can use a particle accelerator's proton beam to treat cancer. It is called "ion therapy" and involves carefully adjusting the beam's energy so the peak you see on the graph at 9:05 occours exactly at the tumor's location, leaving healthy tissue on either side of the tumor mostly unaffected, making it very useful for irradiating tumors located near radiation-sensitve tissues. No, I am not talking outta my arse/wikipedia here, I ACTUALLY researched at such a medical particle accelerator (Austria) during my bachelor thesis. Oh right and no, contrary to what Iron Man 2 makes you believe, a particle accelerator does NOT fire a visually satisfying "laser". Kinda knew that beforehand, but I was kinda hoping to be wrong ;P

[@GrannySoupLadle]

You're good at explaining stuff

[@blazewarking]

another 8 years still waiting for part 2

[@CaptainBrokenTail]

That was wonderful! If only all physics teachers could and were willing to give such a detailed and cohesive answer to such a "dumb" question.

[@MrMaagaard]

You need to take in luminosity as a factor as well. And the particle shower that will happen in the actual proton - nuclei collisions, because these particles will dump their energy in the tissue as well.

[@RJLbwb]

Who thought getting your hand blown off by the most sophisticated machine ever created by humanity would be this complex?

[@mrmusic000]

my entire week was just make by this video! Thanks Thunderf00t, that was a great explination! huge fan of your work and I can't wait for part 2 :)

[@macronencer]

Brilliant video! Very intrigued now, and looking forward to part 2 - thank you for sharing your knowledge :)

[@JJLatBIM]

Awesome start! I can't wait to see more!

[@hummvee69]

Excellent video with a wonderful array of topics. My question is, assuming CERN would still operate and you could put your hand in the beam, how are you going to put your hand in the beam for only one cycle? That's where I see the build up of radiation would occur.

[@joupscott]

Not trying to troll, much respect to thunderf00t but you totally put large HARDon collider at 08:43. Made me do a double take!

[@TheRealRightPrice]

Thunderf00t, I'm so glad I stumbled across your channel on KZbin. I love your videos, finding them both entertaining and informative. I know this video came out a long time ago but still felt like commenting on something. Your explanation for energy transfer was very simple and good but perhaps a more entertaining and equally applicable example to use would be the effect of velocity on the penetrating vs stopping power of bullets when fired from a gun. If you ever review this subject again in another video that example could be a fun one to use. It would also be a particularly understandable to an American (USA) audience, where both gun and military culture a big part of society.

[@TedMan55]

+TheRight Price i was thinking that too, but terminal ballistics gets complicated with bullet weight, size, etc. too many variables to be a good representation. buti know exactly what you mean lol

[@TheRealRightPrice]

+Ted Shinozuka You're right off course and I was ignoring those variables for the sake of simplicity. I figured it would be better not to introduce too many variables that might confuse viewers less familiar with the subject.

[@TheRealRightPrice]

+Ted Shinozuka The example would have to include an explicit statement that all other factors are constant with velocity being the only variable.

[@KryssLaBryn]

I'm pretty sure you wouldn't feel anything at all, considering that the Earth is bombarded by these particles all day long without hands getting blown off. My understanding is that the Collider simply allows them to artificially move the particles so they can study them in controlled conditions. It's like the difference between trying to photograph a drop of water in a rainstorm, & when you carefully drop one in front of the camera. If you control the drop then you know when & where to look.

[@dude157]

It would have to hit the nucleus to break apart the nucleus of the atom. However, I don't believe it has to collide with the nucleus to strip away electrons and create harmful ions in the cells. It is actually a good question that has many variables that need considering.

[@DeletedDelusion]

Great explanation. I always wondered how exactly radiation does damage to living cells. Thank you TF

[@canadianric]

Electron Volt-ish to break a water molecule bond. I learned something today! :)

[@sciencoking]

I think what the professors were considering is that the protons are kept on their circular trajectory and thus remain in the system until they do in fact interact with your hand. Of course interactions will knock them off their course, but assuming that does not happen, their energy really does all have to end up in your hand. In that case, I think evaporation of your hand is the most likely effect, accompanied by lots and lots of stray radiation. After your hand is gone, there would also most likely be plenty of the beam left, so you might just use it as an overkill laser cutter.