試題詳解

17.若已知某位置的假體劑量為D_med，對光子射束而言，相對應等效位置的水中劑量D_water為何？（ ：mean mass energy absorption coefficient， ：average restricted mass collisional stopping power of electron， ：average mass stopping power， ：mass attenuation coefficient）
(A)Dwater = Dmed × (μen/ρ) water / (μen/ρ) med
(B)Dwater = Dmed × (L/ρ) water / (L/ρ) med
(C)Dwater = Dmed × (μ/ρ) water / (μ/ρ) med
(D)Dwater = Dmed × (S/ρ) water / (S/ρ) med