i would like to ask when to apply them, and their attack tables. Assume you are in a space station, and you are exposed to vacuum from a wall that has been punctured by something, or in a spacesuit that got damaged by puncture fire while you are battling on an asteroid.
You more or less summed up almost everything with this. Vacuum crits would apply anytime you are exposed to the hard vacuum of space without any form of life support.
Radiation crits come from being exposed to, how can I put this, radiation. Whether cosmic rays, cosmic particles, gamma rays, alpha and beta particles (these are real) or (fictional but viable) iota radiation, delta radiation, omega radiation, etc. Ever heard of
gamma ray bursts? Sometimes, if close enough, even the strongest shielding won't stop such radiation exposure. Also watch the scifi TV series. They'll give ya good ideas as to when you may need a radiation crit.
rmfr