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Gaokao Physics Practice Question

科学家发现银河系中存在大量的放射性同位素铝 26, 铝 26 的半衰期为 72 万年, 其衰变 方程为 ${ }_{13}^{26} \mathrm{Al} \rightarrow_{12}^{26} \mathrm{Mg}+\mathrm{Y}$, 下列说法正确的是

  1. A.$\mathrm{Y}$ 是氦核
  2. B.$\mathrm{Y}$ 是质子
  3. C.再经过 72 万年, 现有的铝 26 衰变一半
  4. D.再经过 144 万年, 现有的铝 26 全部衰变

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