Jake Hecla, a graduate student in nuclear engineering at the University of California, Berkeley, and a volunteer with The Dogs of Chernobyl initiative, uses a spectroscopy device to measure gamma rays emitted from isotopes, including americium, which is derived from plutonium, and cesium lodged inside the body of an anesthetized stray dog recovering from surgery at a makeshift veterinary clinic inside the Chernobyl exclusion zone on August 17, 2017 in Chornobyl, Ukraine. (Photo by Sean Gallup/Getty Images)
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