http://www.rssboard.org/rss-specification 720 XTF Search Results (f5-subject=Concepts;f4-associated-Lesson=Gamma Ray Science;f6-subject=Gamma radiation) http://ecuip-xtf.lib.uchicago.edu/xtf/search?f5-subject%3DConcepts;f4-associated-Lesson%3DGamma%20Ray%20Science;f6-subject%3DGamma%20radiation Results for your query: f5-subject=Concepts;f4-associated-Lesson=Gamma Ray Science;f6-subject=Gamma radiation Thu, 01 Jan 1970 12:00:00 GMT Gamma-ray penetration of materials. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/500px-Alfa_beta_gamma_radiation_penetration.svg/500px-Alfa_beta_gamma_radiation_penetration.dc.xml Gamma radiation (which includes gamma rays, X-rays, and ultraviolet radiation) cannot penetrate our atmosphere, but can travel through materials such as paper and aluminum. Only heavy metals (such as lead) and other materials like concrete can block gamma rays. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/500px-Alfa_beta_gamma_radiation_penetration.svg/500px-Alfa_beta_gamma_radiation_penetration.dc.xml Thu, 01 Jan 1970 12:00:00 GMT