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Gaokao Physics Practice Question

碘 125 衰变时产生 $\gamma$ 射线, 医学上利用此特性可治疗某些疾病。碘 125 的半衰期为 60 天, 若将一定质量的碘 125 植入患者病灶组织, 经过 180 天剩余碘 125 的质量为刚植入时 的

  1. A.$\frac{1}{16}$
  2. B.$\frac{1}{8}$
  3. C.$\frac{1}{4}$
  4. D.$\frac{1}{2}$

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