Free images results:

Radiation pictures, stock photos and images


TV tower Royalty Free Stock Photos
Author: Easyhwa
Forefinger Royalty Free Stock Photography
Author: Suljo
MRI Royalty Free Stock Photo
Author: Cyberstock

Also, here are some commercial RF-licensed images that match your search criteria:  
Radiation Stock Photography
Author: Buriy

Explore more commercial options: More Radiation Stock Illustrations & Vectors | More Radiation Stock Video Footage