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目的：用电脑计算在每个物体中每点处点源释放出的原始光子和平均能量损失，以获得光子线在水模体中的剂量分布情况。材料：钴６０机器，长方体的水模体（ＰＨＡＮＴＯＭ），圆柱状钴６０源，直径为２．５厘米，高为２．６厘米。野的范围可从６ｃｍ２取到３０ｃｍ２。方法：蒙特卡罗方法。结果：有两种形式：①研究剂量随深度的变化；②相对剂量（Ｒｅｌａｔｉｖｅｄｏｓｅ）。与Ｐｒｏｗｅｓｓ３０００Ｖｅｒｓ３．０４治疗计划的相应结果比较，此程序所得曲线与Ｐｒｏｗｅｓｓ中曲线基本吻合。结论：本程序应用蒙特卡罗方法模拟能量低于３ＭｅＶ的光子输运具有重要的价值。
OBJECTIVE: To calculate the original photon and average energy loss from point sources at each point in each object by computer to obtain the dose distribution of photons in water phantom. Material: cobalt 60 machine, rectangular phantom (PHANTOM), cylindrical cobalt 60 source, diameter 2.5 cm, height 2.6 cm. Wild range can be taken from 6cm2 to 30cm2. Method: Monte Carlo method. Results: There are two forms: ① study dose with depth changes; ② relative dose (Relativedose). Compared with the corresponding result of Prowess3000Vers3.04 treatment plan, the curve obtained by this procedure is basically consistent with the Prowess curve. Conclusion: This program uses Monte Carlo method to simulate the photon transport energy below 3MeV has important value.