actinouranium
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actinouranium
[‚ak·tə·nō‚yu̇′rā·nē·əm] (nuclear physics)
A naturally occurring radioactive isotope of the actinium series, emitting only alpha decay; symbol AcU; atomic number 92; mass number 235; half-life 7.1 × 108 years; isotopic symbol 235U.
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