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Long Island man wearing 9kg-metal necklace dies after being sucked into MRI machine
(www.independent.co.uk)
this post was submitted on 21 Jul 2025
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So the helium itself becomes magnetized, is that it?
the helium is liquid, which it only is when it is very very cold.
The superconductor will keep it's magnetic field forever, as long as it's superconducting, and it will stay superconducting while it is very very cold.
There is physically no way (as in, it is simply impossible, due to how our world works, not money, not people, not technology) to instantly "switch off" the magnet.
it needs to go above a certain temperature, to lose it's superconducting nature, and it needs to do it at a pace that doesn't dump a GINORMOUS amount of energy in this magnetic field instantly, because that would be even worse.
the fault here is in allowing anyone with any magnetic metal anywhere near an MRI. And whoever let that happen is going to have a very bad week.
No, the liquid helium cools the magnets to the point where they become superconductive. As to how that works exactly, I do not know. I don't think I have the math for it.