17.若已知某位置的假體劑量為Dmed,對光子射束而言,相對應等效位置的水中劑量Dwater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