sievert: meaning, definition, pronunciation and examples
Very Low (C2+/Specialised)Formal, Technical/Scientific
Quick answer
What does “sievert” mean?
The SI unit (symbol: Sv) used for measuring the biological effect (dose equivalent) of ionizing radiation.
Audio
Pronunciation
Definition
Meaning and Definition
The SI unit (symbol: Sv) used for measuring the biological effect (dose equivalent) of ionizing radiation.
Represents a quantity of ionising radiation equivalent to one joule of energy per kilogram of absorbing tissue, taking into account the varying biological effectiveness of different radiation types. Named after Swedish medical physicist Rolf Sievert.
Dialectal Variation
British vs American Usage
Differences
No meaningful differences in usage. Both follow the International System of Units (SI). Pronunciation is the primary difference (see IPA).
Connotations
Identical. Purely technical and scientific.
Frequency
Equally low and specialised in both varieties, confined to relevant professional fields.
Grammar
How to Use “sievert” in a Sentence
[Number] sievertsa dose of [Number] sievertsan exposure of [Number] sieverts[Verb] [Number] sievertsVocabulary
Collocations
Examples
Examples of “sievert” in a Sentence
verb
British English
- (The word 'sievert' is not used as a verb.)
American English
- (The word 'sievert' is not used as a verb.)
adverb
British English
- (The word 'sievert' is not used as an adverb.)
American English
- (The word 'sievert' is not used as an adverb.)
adjective
British English
- (The word 'sievert' is not used as an adjective. The adjectival form is 'sievert-based' or 'in sieverts'.)
American English
- (The word 'sievert' is not used as an adjective. The adjectival form is 'sievert-based' or 'in sieverts'.)
Usage
Meaning in Context
Business
Virtually never used, except in the nuclear energy industry for regulatory compliance reports.
Academic
Core term in papers and textbooks on health physics, radiology, nuclear engineering, and environmental radiation studies.
Everyday
Extremely rare. May appear in news reports about nuclear accidents or medical imaging safety.
Technical
Essential and standard unit in all radiation safety protocols, medical physics, and nuclear industry documentation worldwide.
Vocabulary
Synonyms of “sievert”
Vocabulary
Antonyms of “sievert”
Watch out
Common Mistakes When Using “sievert”
- Pronouncing it as 'sigh-vert'.
- Using it as an uncountable noun (e.g., 'too much sievert').
- Confusing it with the related but distinct unit 'gray' (Gy), which measures absorbed energy without biological weighting.
FAQ
Frequently Asked Questions
The gray measures the absorbed dose of energy (joules per kilogram) from radiation. The sievert measures the equivalent dose, which adjusts the gray by a radiation weighting factor to account for the type of radiation's biological effectiveness. For X-rays, 1 Gy = 1 Sv, but for alpha particles, 1 Gy = 20 Sv.
In British English, it's /ˈsiːvət/ (SEE-vert). In American English, it's commonly /ˈsiːvərt/ (SEE-vert) with a clearer 'r' sound, or sometimes /ˈsivərt/ (SIH-vert). The first syllable rhymes with 'see' or 'sea'.
No, it is a highly specialised scientific term. The average person will rarely encounter it outside of specific contexts like news reports on nuclear incidents, medical discussions about scan safety, or scientific documentaries.
Yes. Natural background radiation exposes a person to about 2.4 millisieverts (mSv) per year. A long-haul flight might add 0.04 mSv. A whole-body CT scan can be 10-20 mSv. Acute radiation sickness begins at exposures around 1000 mSv (1 Sv).
The SI unit (symbol: Sv) used for measuring the biological effect (dose equivalent) of ionizing radiation.
Sievert is usually formal, technical/scientific in register.
Phrases
Idioms & Phrases
- “(No idioms exist for this highly technical term)”
Learning
Memory Aids
Mnemonic
Think: Sievert = SI unit + EVER + Tissue. The SI unit you must EVER consider for Tissue damage from radiation.
Conceptual Metaphor
Often conceptualised as a 'currency' of radiation harm or a 'price' paid by biological tissue for exposure.
Practice
Quiz
What does the sievert (Sv) specifically measure?