thorium: meaning, definition, pronunciation and examples
lowtechnical/scientific
Quick answer
What does “thorium” mean?
A weakly radioactive, silvery metallic chemical element with atomic number 90.
Audio
Pronunciation
Definition
Meaning and Definition
A weakly radioactive, silvery metallic chemical element with atomic number 90.
A potential nuclear fuel source, used in some experimental reactors and proposed for advanced nuclear energy cycles due to its abundance and lower long-lived radioactive waste production compared to uranium.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or spelling. Pronunciation differs slightly (see IPA).
Connotations
Neutral technical term in both varieties.
Frequency
Equally low frequency in specialised contexts in both regions.
Grammar
How to Use “thorium” in a Sentence
thorium + noun (e.g., thorium reactor)adjective + thorium (e.g., natural thorium)Vocabulary
Collocations
Examples
Examples of “thorium” in a Sentence
adjective
British English
- The thorium-fuelled reactor design is promising.
- They studied the thorium-rich ore.
American English
- The thorium-fueled reactor design is promising.
- They studied the thorium-rich ore.
Usage
Meaning in Context
Business
Rare, except in discussions of energy investment or mining.
Academic
Common in chemistry, physics, nuclear engineering, and geology papers.
Everyday
Virtually never used in casual conversation.
Technical
Core term in nuclear science, materials science, and radiochemistry.
Vocabulary
Synonyms of “thorium”
Neutral
Watch out
Common Mistakes When Using “thorium”
- Misspelling as 'thorum' or 'thoriam'.
- Confusing it with 'thulium' (Tm) or 'thallium' (Tl).
FAQ
Frequently Asked Questions
Yes, thorium is weakly radioactive and occurs naturally in minerals like monazite.
Not directly. The thorium fuel cycle produces uranium-233, which is fissile, but it is generally considered more proliferation-resistant than traditional cycles.
Existing nuclear infrastructure is optimised for uranium, and the thorium fuel cycle requires more complex chemical processing (reprocessing).
It is found in various minerals, with significant deposits in countries like India, Australia, the United States, and Norway.
A weakly radioactive, silvery metallic chemical element with atomic number 90.
Thorium is usually technical/scientific in register.
Thorium: in British English it is pronounced /ˈθɔː.ri.əm/, and in American English it is pronounced /ˈθɔːr.i.əm/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of 'THOR', the Norse god of thunder, giving power (like nuclear energy) to the element 'thorium'.
Conceptual Metaphor
A SLEEPING GIANT (of energy) – abundant but not yet widely utilised.
Practice
Quiz
What is the primary technical interest in thorium?