Hey folks,
This topic (IMO) didn't seem to gel in any other subforum, so if the mods think it needs to be moved, please do so as you see fit.
Anyhow, at my job we use high voltage RG58 to power ion pumps, and they're getting dosed pretty good. We're upgrading all of the multiconductor cables to rad-resistant stuff, but don't yet have a good option for the coax.
We may not need to upgrade the coax, as the multiconductor stuff is by far more susceptible to damage, but we're starting to look at what our options might be if we have to go that way. The existing coax we use is custom made stuff by an Italian company, that is already supposed to be somewhat rad tolerant. The specific manufacturer's name I'm not sure.
I don't necessarily need to stick to RG58, but the high voltage connectors on our devices are designed for RG-58, so whatever I use has to be adaptable to RG58, and the cable and connectors/ adapters have to be available with a 10 kV rating.
Estimated worst case dose at the source was about 10 Mrad over 700 hr of run time. If I assume it's all gamma, and the dosimeter was about an inch from the source, and my cables are about 3ft away, then my crappy math tells me the dose rate is about 10.95 rem/ hr.
We've already ordered kapton multiconductor from one manufacturer, but they don't offer RG58. We're going to talk to a few more companies, but I figured I'd post this here, in case anyone has any experience, and already has a solution they use.