Bob wrote:
You really want to use Helium. Hydrogen is a bit reactive.
I don't think it's a problem. The alternators on mains powerplants are filled with Hydrogen under fair pressure, and the internal materials and conditions are not that different from a crystal oscillator inside an oven. (IH was chosen both for its heat conduction and its low windage. Helium is enough worse on both counts that it was a non-starter. Of course, windage isn't important in a crystal oscillator.)
In any case, it can't be any worse than filling space capsules with Oxygen....
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