The true coincidence correction for a specific three excited levels de-excitation case has been analyzed, and the typical analytical expressions of true coincidence correction factors have been given.

分析了子核具有三个激发态的典型核衰变情况下的级联校正情况，具体给出了测量滤材源的情况下具有代表性的符合校正因子计算的解析表达式。

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