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# G4 example B0
放疗水箱常用于放疗装置的剂量校准，其尺寸为（x=638mm，y=630mm，z=555mm）。现假设一笔形束从x-y平面中心处，自水箱外向下射入放疗水箱。
请用`Geant4`模拟计算不同能量的光子（1MeV、5MeV、10MeV）入射后在放疗水箱的z方向上的吸收剂量变化曲线。