[jlo mein]

Question in regards to the first season finale and second season premiere:

Spoiler!

So those two main characters get a lethal dose of radiation. Their dialogue made it sound like they both knew they were going to die in hours and nothing could save them.

Then in the second season they spend some time in the ship's medbay and get a medical device implanted in their shoulder. Now they're suddenly fine and won't die? Was this all deus ex machina or did they actually explain before hand that surviving lethal radiation is a thing in this fictional universe?