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I thought these mostly used hydrogen instead of helium? (and as an aside, hydrogen detecting sensors is an area of astounding complexity and cool effects which

I thought these mostly used hydrogen instead of helium? (and as an aside, hydrogen detecting sensors is an area of astounding complexity and cool effects which are worthy of an HN post all on their own)

coryrc 7y ago
I doubt hydrogen would ever be used because it makes metals brittle.
- Gibbon1 7y ago
  I'm pretty sure large generators used hydrogen at one point. I seem to remember reading about them using a palladium membrane to purify the hydrogen used to cool generators.