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> "What if my leg bone actually has metal in it for some reason?!" I have a titanium plate in my head, so it's not magnetic. When the MRI tech asked if I had

> "What if my leg bone actually has metal in it for some reason?!" I have a titanium plate in my head, so it's not magnetic. When the MRI tech asked if I had any metal in me, I said I had titanium on my skull. She asked if I was sure it was titanium. I knew it was, but I was nervous, so I said, "I think so." She half-joked, "Well, if it's not, we'll find out real quick." It was titanium. But they never really double-checked or anything. Part of me thinks that because of my age, she could tell it wasn't iron or anything dangerous. But another part of me feels like she honestly didn't care that much and meant it when she said we'd find out fast.

octopoc 1y ago
Wouldn’t your head have started to get pulled towards it as you approached, so maybe you could stop approaching once you felt something weird going on in your head?
- trod1234 1y ago
  Powerful electromagnets don't work like that. They may switch on and off, and if you are in range, the motion is almost instantaneous. Its not like in the movies where you have to be right up on it, and certain materials may attract at higher rates depending on the amount of ferromagnetic materials affected by the flux. Field flux lines may also be warped depending on the geometry so its possible the drop-off wasn't calculated properly during initial facility design, or it changed. Walking through the wrong door can have consequences as the news has reported.
- nullc 1y ago
  You normally hear it describes as the "field falls off according to inverse cube" but the consider what that means about how the field increases. The effect for magnetic fields is that generally once the field is enough to obviously move an object it's already accelerating uncontrollably.
Aeolun 1y ago
It’s probably of the “if it’s in your head, it can’t be anything other than titanium” variety. It’s not like they’re going to break open your head to check.
- Karawebnetwork 1y ago
  From what I gather, it's between the 80's and 90's that titanium became the norm.

octopoc 1y ago

Wouldn’t your head have started to get pulled towards it as you approached, so maybe you could stop approaching once you felt something weird going on in your head?

trod1234 1y ago
Powerful electromagnets don't work like that. They may switch on and off, and if you are in range, the motion is almost instantaneous. Its not like in the movies where you have to be right up on it, and certain materials may attract at higher rates depending on the amount of ferromagnetic materials affected by the flux. Field flux lines may also be warped depending on the geometry so its possible the drop-off wasn't calculated properly during initial facility design, or it changed. Walking through the wrong door can have consequences as the news has reported.
nullc 1y ago
You normally hear it describes as the "field falls off according to inverse cube" but the consider what that means about how the field increases. The effect for magnetic fields is that generally once the field is enough to obviously move an object it's already accelerating uncontrollably.

Aeolun 1y ago

It’s probably of the “if it’s in your head, it can’t be anything other than titanium” variety. It’s not like they’re going to break open your head to check.

Karawebnetwork 1y ago
From what I gather, it's between the 80's and 90's that titanium became the norm.