--------
In message <[email protected]>, jimlux writes:
>> To get to relevant He levels via the Radon route, we are talking
>> deep unventilated mineshaft kind of concentrations...
>>
>> Hydrogen is a lot more plausible in my view.
>
>Yeah, but in concentrations typical in the "room", I doubt you'd see the
>effect. The experimenters put the phone in a bag full of helium and it
>took hours. I would expect the same in hydrogen.
We're talking across each other here, I was referring to the PRS
anecdote from Karl.
I'll absolutely belive that you can screw up certain kinds of MEMS
devices when you dump 90 kg of Helium into a building.
>That's a lot different than a <1% concentration. I assure you, that if
>there was a helium leak/vent/boil off that made the room concentration
>1%, the room oxygen sensor would be alarming (having dropped to 20%) and
>people would be running for the doors.
That's not my experience, most ${GAS}-level detectors are based on
some kind of chemical reactivty (or spectroscopy if they are _really_
expensive) and they tend to just ignore helium and other noble gasses.
--
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