How would a nuclear explosions operate in the cold, hard vacuum that is Traveller space combat?
Battlestar: Galactica and Mobile Suit Gundam SEED both portrayed nuclear weapons (or fusion/fission technology in general) in an outer-space environment. In one episode of BS:G, the Galactica gets nailed by a thermonuclear warhead that managed to penetrate its curtain of defensive fire, but (to my surprise) the ship survived being crippled or destroyed outright.
I've been digging into MgT-2 over the last few months. Its hard science fiction approach reminds me of The Expanse. The more I dig into it, I find myself daydreaming about the reality of combat in space. No atmosphere to conduct sound, so combat is mostly quiet; ship attack from long distances takes minutes, even longer at extreme ranges. Combat in a hard-sci environment takes on some qualities I'm not used to in most sci-fi settings, and I like it.
How does Traveller handle such considerations? As far as I've managed to peruse, the combat system handles conventional weaponry, but doesn't go into some of the effectively environmental effects of non-conventional occurrences - like the detonation of a fissionable warhead.
In particular, Traveller considers radiation exposure in open space as fairly harmful over short periods of time; without the proper shielding, space travel over long periods of time is extremely hazardous, and space walks without protective layering are reckless. Would the radiation released from a nuclear explosion be more or less considerable in a vacuum?
I appreciate your consideration, and any insightful answers. Direction towards rules, homebrew solutions, and specific examples would be great!