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.
本发明公开了一种多元素耐高温抗震磁控管阴极，由钨、钍、铼、钾组成。
The invention discloses a multi-element high-temperature resistant anti-shock magnetron cathode which comprises tungsten, thorium, rhenium and potassium.
本发明公开了一种多元素耐高温抗震磁控管阴极，由钨、钍、铼、钾组成。
The invention discloses a multi-element high-temperature resistant anti-shock magnetron cathode which comprises tungsten, thorium, rhenium and potassium.
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