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this post was submitted on 18 Nov 2023
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The cryogens boil off at a pretty consistent rate no matter what, but the recovery/recompression systems do require power. So once power is cut, any boil off isn’t recovered.
Superconducting magnets (like in MRIs) can run effectively forever when at the right temperature. Turning them off requires a complex process of draining off that current slowly and carefully so that the magnet isn’t damaged. Hard to do on a normal day, and profoundly harder if there’s no power.
Ahh, makes sense. That's so cool! Do you know what kind of priority a hospital would have if they were to ration electricity? Would an MRI machine be high on that list?
Probably first on the "turn this off" list, its ultimately a diagnostic tool and when it comes to rationing power life support equipment has first priority. Its an insanely power hungry device and shutting it off could let you run dozens of ventilators etc.
So, does that make it primarily useful for if the hospital is looking to do surgery?
IIRC al-Shifa was still doing complicated surgeries really late into the conflict.
Not necessarily, an MRI is great to have but not necessary to carry out surgery, while something like ventilation absolutely is.
Power usage of an MRI machine is pretty mega, it'd be hugely wasteful to prioritise running it vs even just keeping fuel in reserve.