| 词汇 | polonium |
| 释义 | polonium noun[ U ] uk /pəˈləʊ.ni.əm/ us /pəˈloʊ.ni.əm/(symbolPo) a radioactive chemical element that is found in uraniumore钋（铀矿中发现的一种放射性元素） Chemical elements actinium alkali metal americium antimony astatine berkelium brimstone calcium fluorine germanium lithium manganese nickel plutonium quicksilver selenium silicon sodium sulphur transition metal Did you know that Marie Curie, who discovered polonium, died after working for many years with radioactive substances? Examples of poloniumpolonium Information on polonium is not available as it is not separately identified in the overseas trade statistics. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 What exactly is the mechanism of control for polonium 210 in this factory and in factories like it? From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 An extremely sophisticated control mechanism is operated by that plant to monitor polonium 210 and other emissions, such as lead and arsenic. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Average emissions of polonium-210 have been well below the authorised limit. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Polonium 210 has a very short half-life, and decays very quickly; the procedure can therefore contain most of it. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Half of the polonium decays every 138 days due to natural processes. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 After very sophisticated laboratory tests, it was found to be polonium 210. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 They include lead, cadmium, arsenic and also polonium, which is radioactive. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Polonium was found to be concentrated in three areas in that factory, which were then classified as "controlled areas". From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 It is assumed that discharges of polonium-210 were occurring before this discovery but, because of its relatively short half-life, no build-up in the environment can have taken place. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Polonium is of natural origin. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Applications of polonium are few, and include heaters in space probes, antistatic devices, and sources of neutrons and alpha particles. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Radon decays to lead-210, then to bismuth-210, polonium-210 and stabilizes with lead-206. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The bulk of the elements in the periodic table, those to the left of a diagonal line drawn from boron to polonium, are metals. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The inclusion of antimony, polonium and astatine as metalloids has also been questioned. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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