Robin and Jones.
There's a SNAP Generator with potassium and argon filled heat pipes sitting
on the Moon, also in Pioneer-10, Voyagers 1 & 2 and other long term
space probes.
The potassium I used for testing the heat pipes came in steel
containers sealed under Argon pressure.
Also, I used Argon as a cover gas for life-testing the heat pipes in a sealed
glass-covered box at RCA Lancaster (next to Thermacore-Mills environs)
and in the lab, but, I didn't think to look for Heavy Argon, even though
Potassium-Argonide compounds were discussed ca.1967-70.
I gather that Mills is running Potassium-Argon (hydrogen) discharges?
Feel free to retrieve them if you wish. :-)
Fred
