敷钍钨灯丝 thoriated tungsten fiber
钍钨矿 thorotungstite
敷钍钨 thoriated tungsten
钍钨电极 Thoriated Tungsten Electrode ; WTh
敷钍钨阴极 thoriated tungsten cathode
碳化钍钨阴极 carbonized thoriated tungsten cathode
电真空器件用钍钨铼丝 Tungsten-Thorium-Rhenium wires for vacuum tubes
涂钍钨阴极 thoriated tungsten emitter
钍钨极 thoriated electrode
还可用钍钨 thoriated tungsten
正常条件下，在储存、焊接、处置残留物时，钍钨电极的外辐射可以忽略。
External radiation from thoriated tungsten electrodes during storage, welding, or disposal of residues is negligible under normal conditions.
答：钍钨极仍是直流焊最常用的钨电极。但许多人开始避而远之，因为该元素具有放射性。
A: They remain the most common tungsten used in DC applications, but many people are starting to shy away because of the element's radioactivity.
许多物质已被用来作为阳性造影剂：银，铋，铯，钍，锡，锆，钽，钨和稀土化合物已被使用造影剂。
A number of substances have been used as positive contrast agents: silver, bismuth, caesium, thorium, tin, zirconium, tantalum, tungsten and lanthanide compounds have been used as contrast agents.
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