[Spaceships] Force Screen (Energy Variant) vs. Radiation?

[DaltonS]

Force Screen Variants
...
"Energy: Only protects against beam weapons (or energy melee weapons like force swords), radiation, and the burning damage of nuclear or antimatter blasts."

GURP Spaceships page 32

1. What sort of PF (Protection Factor) does this Energy variant offer against radiation in space as described on page 40-41 of GURP Spaceships 5: Exploration and Colony Spacecraft?
2. Does the general Force Screen (SS1 p16) provide any radiation protection?
3. Can the Drive Field design switch (SS1 p31) provide any radiation protection with or without the Energy Variant switch?

I'm thinking of using the invention of a "radiation screen" as the new starting point to my Hyperverse tech sequence (radiation screen => hyperdynamic field grid => reactionless drive => "hypersink" cloaking => jump gate to hyperspace => hyperjump stardrive). I just have to link the "hyper-factor" to the "hyperlimit" I use in my hyperspace rule set.

Dalton "who thinks 30 kSPF sunscreen isn't going to cut it" Spence