申論 2有一法馬型游離腔(Farmer-type ion chamber)放在水假體(water phantom)內,接受直線加速器輸出6 MV的X光射束照射,測得25 nC之電量,試計算量測點位置水的吸收劑量為何?(15分)[平均限制碰撞阻擋本領比(the ratio of average restricted collision stoppingLLpower)()graphite1.002,()water1.127,平均質能吸收係數比(the ratioairairofmeanmassenergy-absorptioncoefficient )(en)graphite0.997,airW(en)water1.111,空氣的()33.97 eV/i.p.]aireair