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

[DaltonS]

Originally Posted by Fred Brackin

The force screens in UT provide PF equal to their DR.

So each dDR provides a PF of 10? That begs the question, just how strong is a "drive field"?

"The GM may rule that any reactionless engine is also a low-powered force screen at no extra power cost."

GURPS Spaceships, page 31

Note it says "low-powered" (not "light") and I have a hard time believing that the dDR of a Rotary Reactionless drive field (0.1G) should be equal to that of a Super Reactionless or Subwarp one (50/100 and 500 Gs respectively). Would multiplying the field's dDR by the drive's sAccel in Gs be appropriate?

Dalton "who hopes someone will field this question" Spence