noun
strontium-90; Sr-90
A radioactive isotope of strontium; used in technical and scientific contexts.
ストロンチウム９０は核実験の降下物に含まれていた。
Strontium-90 was present in the fallout from nuclear tests.
Kanji numeral variant; rarely used in modern scientific contexts.
From English 'strontium' plus the mass number 90.