radioisotope
C2Technical/Scientific
Definition
Meaning
A radioactive isotope of a chemical element, with an unstable nucleus that decays, emitting radiation.
An unstable form of an element used as a tracer in medicine, industry, and scientific research due to its radioactive emissions.
Linguistics
Semantic Notes
The term is a blend of 'radioactive' and 'isotope'. It specifically refers to the *radioactive* property of the isotope, not just any isotope.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or pronunciation differences. Usage is identical across scientific communities.
Connotations
Purely scientific/technical. May have negative public connotations related to radiation hazards, but neutral in professional contexts.
Frequency
Equally low-frequency in general discourse but standard in nuclear physics, medicine, geology, and chemistry.
Vocabulary
Collocations
Grammar
Valency Patterns
The radioisotope [VERB] (e.g., decays, emits, is used)[NOUN] of radioisotope (e.g., production, use, half-life)Radioisotope [NOUN] (e.g., therapy, generator, scan)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “No common idioms”
Usage
Context Usage
Business
Rare, except in sectors like nuclear energy, medical imaging, or radiopharmaceuticals.
Academic
Core term in physics, chemistry, geology, and medical research papers.
Everyday
Very rare. Might appear in news about medical treatments or nuclear incidents.
Technical
Standard, precise term in all fields involving radioactivity and nuclear processes.
Examples
By Part of Speech
verb
British English
- Scientists can radioisotope-label the compound to track its metabolism.
- The sample was radioisotoped for the experiment.
American English
- Researchers radioisotope-tagged the protein to study its pathway.
- The team radioisotoped the water to monitor groundwater flow.
adjective
British English
- The radioisotope imaging revealed the tumour's location.
- We need a radioisotope source for the calibration.
American English
- Radioisotope therapy is a targeted cancer treatment.
- The probe contained a radioisotope material.
Examples
By CEFR Level
- Doctors sometimes use a radioisotope to see inside the body.
- Some rocks contain natural radioisotopes.
- The most common radioisotope used in medical imaging is technetium-99m.
- Archaeologists use carbon-14, a radioisotope, to date ancient objects.
- The radioisotope's half-life determines its suitability for diagnostic procedures.
- Production of the therapeutic radioisotope lutetium-177 has increased significantly.
Learning
Memory Aids
Mnemonic
Think: RADIO (as in radiation) + ISOTOPE (a form of an element). A radioisotope is the 'radioactive version' of an element's isotope.
Conceptual Metaphor
Often conceptualised as a 'tag' or 'beacon' (e.g., a radioisotope tracer tracks movement) or as a 'power source' (e.g., in generators).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with just 'изотоп' (isotope). Must be 'радиоизотоп' or 'радиоактивный изотоп'.
- Avoid calquing as 'radio' + 'изотоп' without understanding the 'radio-' prefix means 'radioactive' here.
Common Mistakes
- Misspelling as 'radio isotope' (should be one word or hyphenated: radioisotope or radio-isotope).
- Using it to refer to any isotope, not specifically radioactive ones.
- Incorrect stress: placing primary stress on 'radio-' instead of '-iso-'.
Practice
Quiz
What is the defining characteristic of a radioisotope?
FAQ
Frequently Asked Questions
No. Only isotopes with an unstable nucleus that undergoes radioactive decay are radioisotopes. Stable isotopes are not radioactive.
Not always. Risk depends on the type and energy of radiation emitted, the half-life, and the dose. Many are used safely in tiny amounts in medicine.
They are often used synonymously. 'Radionuclide' is a broader term for any atom with an unstable nucleus, while 'radioisotope' specifies it is an isotope of a particular element.
Common uses include: medical diagnostics (PET/CT scans), cancer therapy, industrial radiography, tracing in research, and power sources in space probes (RTGs).