Wiktionary英語版

出典：Wiktionary

uranium-234

出典:『Wiktionary』 (2025/01/19 21:59 UTC 版)

名詞

uranium-234 (uncountable)

  1. (physics) A radioactive isotope of uranium, 92U, having a half-life of about 250,000 years; it accounts for about 55 parts per million of natural uranium; it is a member of the uranium-238 decay chain (aka "uranium series").
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ウィキペディア英語版

出典：Wikipedia

Uranium-234

出典:『Wikipedia』 (2011/06/25 20:41 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

Uranium-234 is an isotope of uranium. In natural uranium and in uranium ore, U-234 occurs as an indirect decay product of uranium-238, but it makes up only 0.0055% (55 parts per million) of the raw uranium because its half-life of just 245,500 years is only about 1/18,000 as long as that of U-238. The path of production of U-234 via nuclear decay is as follows: U-238 nuclei emit an alpha particle to become thorium-234 (Th-234). Next, with a short half-life, Th-234 nuclei emit a beta particle to become proactinium-234 (Pa-234). Finally, Pa-234 nuclei emit another beta particle to become U-234 nuclei.

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