On 11/1/18 8:52 AM, Poul-Henning Kamp wrote:
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In message <[email protected]>, Bob kb8tq writes:
A lot of Radon and *really* poor ventilation….
Yup.
But a LOT of Radon is not without interesting "side-effects", such as
much easier ionization due to the alpha radiation.
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.
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.
I'd be betting more on some RFI/EMI issue from the RF fields or the
magnetic fields, both of which are quite strong in an MRI facility.
However, in true time-nuts fashion, I'm going to rummage around for some
older SiTime oscillators on an eval board at work, and we can do a
*real* test.
I got some samples from them a few years ago, so all I have to do is
find that tiny plastic bag with the tiny 2x2mm parts in it.
Then I have to find some spare hydrogen and helium..
After all, we really need to evaluate it in an atmosphere of Argon and
CO2, (Mars gas) - I'll see if we've got some around - we were doing RF
breakdown tests in simulated Martian atmosphere <grin> (BTW, the
Martian atmosphere is unique in that it probably has the lowest "minimum
sparking voltage" in the universe)
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