Diagram, "Types of Radiation in the Electromagnetic Spectrum."
Glenna Shields, U.S. Environmental Protection Agency.
<a rel="nofollow" class="external text" href="https://web.archive.org/web/20021019071034/http://www.epa.gov/radiation/understand/ionize_nonionize.htm">Types of Radiation in the Electromagnetic Spectrum</a>. U.S. Environmental Protection Agency (EPA). Archived from <a rel="nofollow" class="external text" href="http://www.epa.gov/radiation/understand/ionize_nonionize.htm">the original</a> on <span class="mw-formatted-date" title="2002-10-19">2002-10-19</span>.