"Gamma Rays" 25 Aug. 2009. Web. 18 April 2013. <>.  


Ronca, Debra.  "How Radiation Works." 23 Jul. 2008. Web. 18 Apr. 2013. <>. 


Science Mission Directorate. "Gamma Rays." Mission: Science. 2010. National Aeronautics and Space Administration. Web.17 Apr. 2013. <>.

What are gamma rays?


Gamma rays have the shortest wavelength. They are the most penetrating of all electromagnetic radiation. In medicine, gamma rays can serve in radiation therapy to treat cancer by shrinking or destroying a tumor.