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"We're dead."

— Holden, The Expanse episode "Critical Mass" (S1E9)

In "Critical Mass", the ninth episode of The Expanse, Holden and Miller are exposed to a high dose of radiation. When Miller asks how bad it is, Holden replies that it's lethal.

Through much of the following episode, "Leviathan Wakes", Holden and Miller are desperately trying to reach the Rocinante.

Once they do, the implication is that they're saved. How?

And if such powerful anti-radiation medication exists, why would Holden declare themselves dead?

"We're dead."

— Holden, The Expanse episode "Critical Mass" (S1E9)

In "Critical Mass", the ninth episode of the TV series of The Expanse, Holden and Miller are exposed to a high dose of radiation. When Miller asks how bad it is, Holden replies that it's lethal.

Through much of the following episode, "Leviathan Wakes", Holden and Miller are desperately trying to reach the Rocinante.

Once they do, the implication is that they're saved. How?

And if such powerful anti-radiation medication exists, why would Holden declare themselves dead?

Is overexposure to radiation curable in The Expanse?

While this question was brought on by the TV series, I'm interested in answers from the entire franchise.