3 ms·
I used to be friends with a physics grad student at my local university. He showed us their particle accelerator, in an underground room with the control room a
by DennisP 5y ago
I used to be friends with a physics grad student at my local university. He showed us their particle accelerator, in an underground room with the control room above.
He said if a certain light and siren went off we had thirty seconds to get out. They installed that after someone fired the accelerator while someone else was in the room, and seriously hurt the guy. He didn't know anything was happening at the time but ended up losing a couple limbs.
- nomoreplease 5y ago> He didn't know anything was happening at the time but ended up losing a couple limbs. Surely that would have been reported by the university (PR, damage control) and in the news? Can you confirm?
- redis_mlc 5y agoFYI: the human body redirects blood flow for internal organ use after various forms of trauma or infection, sacrificing the limbs, usually 2 or 4. Typically it takes a week or two before doctors cut them off. That's more likely than his limbs being left behind on campus.
- DennisP 5y agoHe told me about it back in the early 90s, and it had happened years before that, though I don't know how many. A quick google doesn't bring anything up, but a local newspaper would have had to put their old archives online without paywall.
- voldacar 5y agoI'm not sure I understand - how did the injured man actually place himself in the path of the particle beam? Given that particle accelerators are a sealed vacuum environment? Or could you be harmed by simply standing next to the accelerator while it's operating? If so, how is that energy reaching you?
- zaarn 5y agoFor experiments, it's not unusual that the actual test is taking place in atmosphere. There is no issue as you can simply put a solid metal cap on the end of the accelerator and the beam will just blast through it with no issue and the atmosphere isn't going to slow it down significantly over the next few meters.
- voldacar 5y agoThanks, I didn't know that. In a situation like that, is most of the danger to a human from bremsstrahlung, or the actual original beam of particles?
- zaarn 5y agoBoth and more. The danger from the beam is limited to a specific energy intensity, otherwise the beam will pass through without depositing much energy (there is ways to calculate this). The bigger dangers are all the atoms the beam knocks out on it's way that are likely to transmute into radioactive isotopes via various modes of actions as well as the hard bremsstrahlung generated by the beams interactions as well as some of the stuff it knocks along (there is enough energy that if the beam knocks into an electron, the electron will dump some bremsstrahlung while it slows down again).
- DennisP 5y agoInteresting. I always assumed the radiation was from the target.
- deleted 5y ago[deleted]