promethium dans le dictionnaire Oxford-Hachette

Traductions de promethium dans le dictionnaire anglais»français

promethium [GB prəˈmiːθɪəm, Am prəˈmiθiəm] SUBST

promethium

prométhium m

Traductions de promethium dans le dictionnaire français»anglais

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prométhium

promethium

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anglais

Promethium-147 is produced in large quantities (compared to other isotopes) by bombarding uranium-235 with thermal neutrons.

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Where indefinite self-luminosity in darkness was required, safer radioactive promethium paint was initially used, later replaced by tritium which continues to be used today.

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Promethium is also used to measure the thickness of materials by evaluating the amount of radiation from a promethium source that passes through the sample.

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Another method is to bombard uranium-238 with fast neutrons to cause fast fission, which, among multiple reaction products, creates promethium-147.

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Finally, promethium can be formed in nature as a product of spontaneous fission of uranium-238.

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Originally, radium-226 was used for the purpose, but it was later replaced by promethium-147 and tritium (hydrogen-3).

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Another way to produce promethium-147 is via neodymium-147, which decays to promethium-147 with a short half-life.

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Only the highly unstable and radioactive promethium rare earth is quite scarce.

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However, if the packaging is damaged, then promethium becomes dangerous to the environment and humans.

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Many properties of promethium rely on its position among lanthanides and are intermediate between those of neodymium and samarium.

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