thorium-228
radiothorium a`di*o*tho"ri*um (r[=a]`d[i^]*[o^]*th[^o]r"[=e]*[u^]m), n. (Chem.) an earlier name for the thorium isotope {thorium-228}, given by its discoverer Otto Hahn. It is a radioactive substance formed as one of series of products in the chain of radioactive decay of thorium. Its immediate predecessor in the chain is Actinium-228, and it decays by alpha emission to radium-224 with a half-life of 1.91 years. The name radiothorium was given prior to the full understanding of the nature of isotopes of elements. [PJC]

The Collaborative International Dictionary of English. 2000.

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  • Thorium-228 — is an isotope of thorium which has 90 electrons and protons and 138 neutrons. It has a half life of 1.9116 years. It is highly unstable and is not found in nature. When it decays, it emits an alpha particle and turns into Radium 224. Occasionally …   Wikipedia

  • thorium-228 — noun radioactive isotope of thorium with mass number 228 • Syn: ↑radiothorium • Hypernyms: ↑thorium, ↑Th, ↑atomic number 90 …   Useful english dictionary

  • thorium-228 — noun A radioactive isotope of thorium, , having a half life of 1.4 x 10 years; it occurs naturally, and is a source of nuclear energy Syn: radiothorium …   Wiktionary

  • THORIUM — En 1828, Jöns Jacob Berzelius découvrit un nouveau métal qu’il baptisa thorium en l’honneur de Thor, dieu de la mythologie scandinave. Bien qu’il soit relativement rare, cet élément a été utilisé depuis longtemps dans l’industrie, principalement… …   Encyclopédie Universelle

  • thorium series — noun : a radioactive series beginning with thorium of mass number 232 and ending with thorium D which is the nonradioactive isotope of lead of mass number 208: thorium, at. no. 90 → mesothorium 1, at. no. 88 (syn. radium 228) → mesothorium 2, at …   Useful english dictionary

  • Thorium fuel cycle — The thorium fuel cycle is a nuclear fuel cycle that uses thorium 232 as fertile material and uranium 233 as fissile fuel. A major advantage of the thorium fuel cycle is that production of plutonium and other long lived actinides as radioactive… …   Wikipedia

  • Thorium — Eigenschaften …   Deutsch Wikipedia

  • Thorium 232 — Le thorium 232, noté 232Th, est l isotope du thorium dont le nombre de masse est égal à 232 : son noyau atomique compte 90 protons et 142 neutrons avec un spin 0+ pour une masse atomique de 232,0380553 g/mol. Il est caractérisé par un excès… …   Wikipédia en Français

  • Isotopes du thorium — Le thorium (Th) comme tous les éléments de numéro atomique supérieur à celui du plomb, ne possède aucun isotope stable. Cependant, il possède six isotopes présent dans la nature et l un d eux, le thorium 232 (232Th), est relativement stable, avec …   Wikipédia en Français

  • Торий-228 — Таблица нуклидов Общие сведения Название, символ Торий 228, 228Th Альтернативные названия радиоторий, RdTh Нейтронов 138 Протонов 90 Свойства нуклида Атомная масса …   Википедия

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