radioactive isotope
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
A version of an element whose nucleus is unstable and breaks down over time, releasing radiation.
Synonyms and antonyms
Synonyms
radioisotope
Test yourself
Which word fits the gap? "Doctors use a _____ with a short half-life to safely image the thyroid gland."
Answer: radioactive isotope
In your own words, what does "radioactive isotope" mean?
A version of an element whose nucleus is unstable and breaks down over time, releasing radiation.
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