单词	thorium
释义	thorium noun tho·​ri·​um ˈthȯr-ē-əm  : a radioactive metallic element that is obtained especially from monazite and is usually associated with rare earths see Chemical Elements Table Example Sentences Recent Examples on the Web Rare earths, a group of 17 elements near the bottom of the periodic table, are not radioactive, but radioactive contaminants like uranium and thorium occur naturally in rare earth deposits. New York Times, 22 Aug. 2022 After accounting for the mineral makeup of NWA 7034, which is highly magnetized and high in potassium and thorium, researchers built an algorithm to narrow down the potential craters that NWA 7034 could originate. Tim Newcomb, Popular Mechanics, 20 July 2022 In the core, the radioactive thorium heats the molten salt, which turns water into steam and activates a turbine to make electricity. Jacopo Prisco, CNN, 3 June 2022 An international team of archaeologists explored Cueva de Ardales from 2011 to 2018, then used radiocarbon and uranium-thorium dating techniques to understand the cave’s history. Sarah Kuta, Smithsonian Magazine, 3 June 2022 These natural uranium isotopes decay into the element thorium, which in turn decays into protactinium, and each has its own isotopes. Artemis Spyrou, The Conversation, 24 May 2022 Below is a video of the moment, with fan music added in, and also the entire video of Hoglund discussing thorium, nuclear power and molten salt reactors. Ryan Parker, The Hollywood Reporter, 14 May 2022 One focus of research is using new fissile materials such as thorium, which is more abundant, produces less waste and has no direct military applications. Gernot Wagner, WSJ, 7 Jan. 2022 The plant received uranium, thorium and beryllium ores between the 1940s and 1967, which is the same year Colonia High School was built. Audrey Conklin, Fox News, 19 Apr. 2022 See More Word History Etymology New Latin, from Old Norse Thōrr Thor First Known Use 1832, in the meaning defined above Medical Definition thorium noun tho·​ri·​um ˈthōr-ē-əm, ˈthȯr-  : a radioactive metallic element that occurs combined in minerals and is usually associated with rare earths —symbol Th see Chemical Elements Table
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