TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

THORIUM [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 - external organization data 2012-01-25

English

Subject field(s)
  • Chemistry
  • Compartment - Canadian Nuclear Safety Commission
CONT

thoron daughters: The following short-lived radioactive substances produced by a series of radioactive disintegrations starting with the disintegration of radon-220: polonium-216 (thorium A), lead-212 (thorium B), bismuth-212 (thorium C) and polonium-212 (thorium C').

French

Domaine(s)
  • Chimie
  • Tiroir - Commission canadienne de sûreté nucléaire
DEF

Radioélément de période d'une durée de 0,158 seconde.

CONT

produits de filiation du thoron : Substances radioactives à courte période énumérées ci-dessous produites par une série de désintégrations radioactives commençant par la désintégration du radon 220 : le polonium 216 (thorium A), le plomb 212 (thorium B), le bismuth 212 (thorium C) et le polonium 212 (thorium C').

Key term(s)
  • polonium-216

Spanish

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Record 2 - external organization data 2008-02-22

English

Subject field(s)
  • Chemistry
  • Geochemistry
  • Nuclear Waste Materials
  • Compartment - Canadian Nuclear Safety Commission
DEF

A radioactive, silvery-white, metallic element in group III of the periodic system.

CONT

... uranium and thorium are the dominant elements in discussions about low-level radioactive wastes. They are the "parents" of the "decay chains" of radionuclides ...

OBS

The most stable of its 13 radioactive isotopes (thorium 223 to thorium 235) is thorium 232 which occurs naturally, has a half-life of 1.4 X 1010 years, emits alpha particles, and is the parent of the thorium disintegration series. ... Symbol, Th; valence, 4; isometric; atomic number, 90; atomic weight, 232.038; ...

French

Domaine(s)
  • Chimie
  • Géochimie
  • Déchets nucléaires
  • Tiroir - Commission canadienne de sûreté nucléaire
DEF

Métal blanc, [...] ductile [...] radioactif faisant partie du groupe des actinides.

OBS

Le plus stable de ses 13 isotopes radioactifs (thorium 223 à thorium 235) est le thorium 232 qu'on rencontre dans la nature. Numéro atomique 90, poids atomique 232,038.

Spanish

Campo(s) temático(s)
  • Química
  • Geoquímica
  • Desechos nucleares
  • Compartimiento - Comisión Canadiense de Seguridad Nuclear
DEF

Elemento metálico radiactivo, número atómico 90.

CONT

[...] el interés principal del torio [...] resulta de su calidad de materia fértil: expuesto al flujo de neutrones rápidos en el seno de un reactor autorregenerador, el torio 232 absorbe un neutrón y se convierte en torio 233, el cual, mediante emisión de una partícula beta se convierte en proactinio 233 que, por pérdida de otra partícula beta, da uranio 233, isótopo éste que es físil y puede servir como combustible nuclear en otro reactor.

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