They are composed of positive ions whose identity depends on the residual gas inside the tube.
By that time any residual gas will have degraded.
The booster supplies an increased amount of residual gas from the barrel for the gas system.
Even an empty canister has enough residual gas to blow up a house.
Damping results from the residual gas sealed in the device.
The residual gas after such processing becomes part of the refinery's fuel gas system.
The getter continually removes this residual gas as it is produced.
The momentum also reduces scattering in the target and in any residual gas.
There would be enough residual gas to force us to wear our masks below.
Although the structures are still emitting residual gas, at present the amounts are too small to have any effect.