Uhhhh, except yes it was original for it's time? In fact most heroes' way of gaining their powers is original in it's own right.
Superman's powers resulted from his Kryptonian physiology being exposed to yellow Sun radiation.
Green Lantern got his powers from a previous Lantern who died, needs his ring recharged every 24 hours or after using it extensively.
Wonder Woman was built from clay and given life via magic.
Captain America is a result of a super-serum experiment.
Vic Stone became Cyborg after a freak accident which prompted his father to save his life by fusing him with advanced machinery.
Tony Stark built his Iron Man armor in a cave with box of scraps.
Spider-Man/Peter Parker was bitten by a radioactive spider.
Fantastic Four got exposed to cosmic rays which gave them their powers.
Bruce Banner turned into hulk after an accident involving Gamma radiation.
Bruce Wayne became Batman after spending years honing his combat and detective abilities.
See where I am going with this?