"Radioactive" was used heavily in promotion for the video game Assassin's Creed III.
"Radioactive" is an electronic rock and alternative rock song with elements of dub-step that contains cryptic lyrics of apocalyptic and revolutionist themes.
The song's lyrics speak of apocalyptic and revolutionist themes.
NPR music critic Ann Powers has opined that the song features strong "religious or spiritual imagery", the likes of which have been common throughout the history of rock music.
The song is written in the key of B minor.