試題詳解

15.下列有關單一能量窄光子射束半值層（HVL）的敘述何者正確？
(A)1^st HVL = 2nd HVL = 3rd HVL
(B)1^st HVL < 2nd HVL < 3rd HVL
(C)1^st HVL > 2nd HVL > 3rd HVL
(D)1^st HVL , 2nd HVL , 3rd HVL 互不相關