Assertion: beryllium's isotope | /r/HasProperty | radioactive
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Source sentences:
text: Beryllium has but a single isotope, beryllium-9 which is not radioactive but beryllium-10, which cosmic rays produce in the upper atmosphere, is radioactive with a half-life of 1.5 million years.
text: Beryllium has but a single isotope, beryllium-9 which is not radioactive but beryllium-10, which cosmic rays produce in the upper atmosphere, is radioactive with a half-life of 1.5 million years.
text: The other 10 isotopes of beryllium are also unstable, and also radioactive, and they have very short half-lives, the longest of which is 53 days, beryllium-7.