If you like Kraftwerk and you're not aware of this book, I recommend it:

"Kraftwerk: Future Music from Germany", by Uwe Schütte. It's packed with details of albums, songs, tours, equipment, and people.

The anti-nuclear message in "Radio-Activity" certainly came later and was repeatedly updated, right into the Fukushima era [2011], but this was not the original sentiment [1976]. From the book:

"At the time, Billboard magazine featured the most-played singles by the large network of radio stations under the heading 'Radio Action'. The band seemed to have misread or misremembered this as 'Radio-Activity'. 'Suddenly,' remembers Wolfgang Flür, 'there was a theme in the air, the activity of radio stations, and the title of 'Radioactivity is in the Air for You and Me' was born. All we needed was the music to go with it. ... The ambiguity of the theme didn't come until later.' Radio-Activity was intended to celebrate radio broadcasting as a convenient, easy and democratic means to listen to music and news."