通过对双流县水环境质量现状调查，发现双流县点源分布较为集中。
Through investigation on the water environmental quality current situation of Shuangliu County, it has been found that point sources in Shuangliu County distribute comparatively centralized.
分层介质中简谐点源的声场具有确定的角度分布。
The field of a harmonic point source in layered media has certain angular distribution.
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。
Object: Using computer to calculate average energy lost by photons at every points in each body, in order to determine the dose distribution of photon radiation in the water phantom.
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