铅对(来学网)钴的γ射线的半价层是1.25cm,因此其线性吸收系数约为
  • A.
    (来学网)0.125/cm
  • B.
    (来学网)0.346/cm
  • C.
    (来学网)0.554/cm
  • D.
    (来学网)0.692/cm
  • E.
    (来学网)0.885/cm