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目的 :验证几何计算法设计60 Co相邻野预留间隔的准确性 ,探讨更精确的设计方法。方法 :通过模拟测量绘制线束扩展函数曲线 ,与几何计算法计算结果对照比较 ;利用线束扩展函数曲线 ,计算不同射野宽度相邻野组合预留间隔计算值与测量值偏差。结果 :①两种方法得出的线束扩展函数曲线有明显差异。②两小野组合计算值低于测量值 ,两大野组合计算值高于测量值 ,大野与小野或两个中等野组合计算值与测量值偏差较小。结论 :几何计算法设计60 Co相邻野预留间隔有偏差 ,通过测量建立半影重叠法更精确
OBJECTIVE: To verify the accuracy of geometry calculation method for designing 60 Co adjacent field reservation interval and to explore more accurate design method. Methods: The curve of harness expansion function was drawn by simulation and compared with the result calculated by geometric calculation method. The calculated value and measured value deviation of reservation interval of adjacent fields with different field width were calculated by using the curve of harness expansion function. Results: ① The curves of the beam expansion function obtained by the two methods are obviously different. ② The calculated value of two wild combinations is lower than the measured value, the calculated value of the two wilds is higher than the measured value, and the deviation between Ono and Ono or the combination of the two middle fields is small. CONCLUSIONS: Geometrical calculations have been used to deviate from the 60 Co adjacent field reservation intervals and to establish a more accurate