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If you're talking about superconducting magnets, because the boiling point of argon is way too high.

If you're talking about electromagnets (I don't know that any MRI instruments actually use electromagnets, but quite a few research NMR instruments, which use the same principle, do), then it's because argon, as a monatomic gas, has a low heat capacity. The usual coolant for an electromagnet in an NMR spectrometer is the much cheaper and more readily available water, which is both a darn good coolant in its own right, and can be readily re-cooled for another pass through the coils with a swamp cooler.

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14y ago

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