Sure, "Power" is not explicitly about the fact that Marie Curie was an all around barrier-breaking chick, but we'd be remiss not to point out the fact that she was totally ahead of her time as a female scientist. She was off discovering radium twenty years before women could even vote in the U.S. (just to give you a little frame of reference). Marie Curie is famous for being a scientist, but she's become an icon for being a woman scientist.
Curie's gender is totally not important in "Power." This poem would pack just as big of a punch if it were about a dude.
The fact that Curie was a woman is totally important to "Power," because only a woman would have kept mum about the negative effects of her work.